Revised Thu Aug 24 2023
The Physics Lecture Demonstrations in the Department of Physics and Astronomy at Johns Hopkins University are listed in the table below according to the topic area that best describes the physical concept(s) illustrated. The listing broadly follows the PIRA demonstration classification scheme order. For each topic, there follows a list of one or more demonstrations. These are listed by number and name, and are followed by a short description of the demonstration. An underlined demo name is a hyperlink to additional information about that demonstration. A more detailed listing of demonstrations is available upon request.
Mechanics | |||
Measurement | |||
Basic Units | |||
M-a1d |
Standard Mass |
Show and tell about a 1-kg standard mass. |
|
M-a1a |
Meter Standard |
A replica of the platinum-iridium bar in Paris that was the international standard for length before 1960. |
|
M-a1b |
One Nanosecond Bar |
A piece of plastic cut to a 1 ns length and imprinted "one nanosecond." Ruler shown for comparison. |
|
M-a1c |
One Mole Bars |
Set containing one mole each of iron, copper, zinc, and aluminum. |
|
Error and Accuracy | |||
M-a2a |
Probability Board |
Balls roll down a nail board into parallel chutes forming a Gaussian distribution. Large and small versions available. |
|
Coordinate Systems | |||
M-a3a |
3-D XYZ axes |
A simple 3-D XYZ Coordinate System |
|
Vectors | |||
M-a4b |
NTNU Vector Addition Simulation |
A 2-D and 3-D vector simulation: http://www.phy.ntnu.edu.tw/java/vector/vector.html |
|
M-a4c |
PhET Vector Addition Simulation |
Colorado PhET 2-D vector simulation: http://www.colorado.edu/physics/phet/simulations/vectormath/vectorMath.swf |
|
M-a4a |
Magnetic Blackboard Vectors |
A set of magnet-backed vectors of lengths 3, 4, and 5 used to show vector addition on the blackboard. |
|
Math Topics | |||
M-a5a |
Rotation with Rotary Motion Sensor |
Use a rotary motion sensor to show angular displacement and angular velocity vs. time on the computer. |
|
M-a4e |
Dirac String Trick |
Strings become untangle-able when this device is rotated through 720 degrees but not 360 degrees |
|
M-a4d |
Klein Bottle |
Show and Tell Item: Klein Bottle |
|
Scaling | |||
M-a6a |
Movie--Powers of Ten |
"Powers of Ten" is a 9 minute film spanning scales from the edge of the universe to the sub-atomic. URL: https://www.youtube.com/watch?v=0fKBhvDjuy0 |
|
M-a6b |
Movie--Cosmic Voyage |
"Cosmic Voyage" is a glitzy 35 minute film with an 8:45 minute powers-of-ten cosmic zoom sequence, plus descriptions and visualizations of varied scientific theories exploring the origin of man. Available on DVD only. |
|
M-a6d |
Movie: Galaxy |
2 min. 50 sec. animated musical video, based on NASA photos, about the galaxy and man's small place in it. http://dingo.care2.com/cards/flash/5409/galaxy.swf |
|
M-a6e |
Simulation - Scale of Universe |
Interactive Scale of the Universe Tool in Adobe Flash |
|
M-a6c |
Diluting dye solution - Powers of Ten |
Ten ml of a strong dye solution is transferred to a 90ml solution of water; 10 ml of the result is transferred to another 90 ml of water, ad infinitum to show "one millionth" and "one billionth" and so on. |
|
Motion in One Dimension | |||
Position, Velocity, Acceleration | |||
M-c1d |
Motion Detector and Student |
An ultrasonic motion detector generates a real-time graph of displacement (and/or veloctiy and/or acceleration) versus time as a person walks back and forth in front of the detector. |
|
M-c1k |
Position, Velocity, Acceleration of Cart on Track |
A smart cart and track generate a real-time graph of displacement (and/or veloctiy and/or acceleration) versus time. |
|
Velocity | |||
M-c1a |
Addition of Velocities--Tank and Sheet |
A battery powered tank runs at constant speed on a moving paper to show how velocities add and subtract. |
|
M-c1b |
Linear Air Track: Position vs. Time |
A glider travels down the 5 m air track while evenly spaced photogates record the elapsed time. One can then plot the position versus time for the glider on an overhead. The track may be inclined for uniformly accelerated motion. |
|
M-c1c |
Linear Air Track: Instantaneous Velocity |
An air track glider passes through two pairs of closely spaced photogates with each pair separated by 2 meters, enabling instantaneous velocities, accelerations, and predicted distances to be calculated. |
|
Uniform Acceleration | |||
M-c2a |
Dime and Feather Tube |
A penny and a feather fall freely inside a glass cylinder that can be evacuated. |
|
M-c2c |
Basketball and Tennis Ball drop |
Basket and Tennis balls are dropped simultaneously from the same height. |
|
M-c2b |
Inclined Air Track |
Prop up one end on an air track and use photogates to time the glider's voyage. |
|
M-c2d |
Video: 405 the movie |
2000 film of a plane making an emergency landing on top of Jeep: http://www.405themovie.com/. 3min13sec. (For amusement purposes) |
|
Measuring g | |||
M-c3a |
Timed Free Fall -- Lecture Hall |
A metal ball is dropped from 1m and then from 4m into a catch bucket; a precise digital timer records the time of flight for each fall. [May conflict with Shoot-the-Monkey or Balls Shot and Dropped.] |
|
M-c3b |
Timed Free Fall -- Classroom |
A metal ball is dropped from 0.5m and then from 2m; a precise digital timer records the time of flight for each fall. |
|
M-c3c |
Timed Free Fall -- Newton's g Ball |
Newton's g-ball's built-in stopwatch measures free fall times for arbitrary throws |
|
Motion in Two Dimensions | |||
Displacement in Two Dimensions | |||
M-d1b |
Cycloid Generator - Lamp on Wheel |
A light bulb at the rim of the wheel traces out a cycloid. |
|
M-d1a |
Mounted Rotating 2D figure |
An asymmetrical slab that can be mounted and rotated. |
|
M-d1f |
Balls on Rotating Disk |
A disc with two balls mounted at different radii rotates at varying speeds. A third ball may be placed in the center if disk is horizontally mounted. Both orbital and spin rotations may be seen. |
|
Velocity, Position, and Acceleration | |||
M-d1e |
High road low road - large version |
Two balls race, one following a straight channel and the other along a channel with a valley. |
|
M-d1g |
Galileo's Circle - Inverted |
Two balls following different chords of a circle hit base at the same time. |
|
Motion of the Center of Mass | |||
M-d4b |
Throwing Foam Slab |
A slab of foam has its center of mass marked with a black dot; this dot follows a parabolic path when the slab is thrown. |
|
M-d4c |
Pendulum Air Cart |
This air track glider has a heavy pendulum; when the pendulum is set swinging the glider moves in the opposite sense. Collisions with the track bumper show interesting behavior |
|
M-d4e |
Air Track Inchworm |
Two air track gliders coupled by a spring will oscillate about the center of mass that is marked by a flag. |
|
Central Forces | |||
M-d5d |
Ball on a String |
Attach a lightweight ball to a string and twirl |
|
M-d5a |
Orbit Ball |
This consists of a large and a small ball attached to opposite ends of a string which passes through a metal handle. The light ball is twirled and the centripetal force is provided by the weight of the heavy ball. |
|
M-d5b |
Conical Pendulum |
Three balls, suspended by differing lengths of string from the same height on a rotating shaft, rotate in the same horizontal plane. |
|
M-d5c |
Swing the Bucket |
Swing a bucket of water in a vertical circle and then in a horizontal circle over your head. |
|
M-d5e |
Chain Wheel |
A loop of chain is rotated very fast and then released onto the demo table, where it runs over obstacles while retaining its circular form. |
|
Deformation by Central Forces | |||
M-d5k |
Rotating Tank |
A large but thin, clear rectangular box is half-filled with colored water and rotated. The water surface forms a parabola. |
|
Centrifugal Escape | |||
M-d5m |
Tangential Velocity |
This demo uses an apparatus that rotates a ball on a string and that provides a means to cut the string while the ball is in flight. |
|
M-d5n |
Ball and Hoop |
A hoop that confines a ball to a circular orbit is suddenly removed |
|
M-d5p |
Grinding Wheel |
Sparks fly off the grinding wheel in a straight line. |
|
M-d5o |
Falling off the Merry-go-round |
Blocks lined up radially on a turntable fall off in succession as the turntable speeds up. |
|
Projectile Motion | |||
M-d6c |
Jumping Ball on Cart |
A ball projected vertically upward from a wheeled cart falls back into the muzzle. |
|
M-d6b |
Jumping Block -- Air Track |
A ball projected vertically upward from a moving air track glider falls back into the muzzle. |
|
M-d6d |
Balls Shot and Dropped -- Lecture Hall |
A ball is dropped and simultaneously another is projected horizontally; they hit the floor at the same time. [May conflict with Shoot-the-Monkey and Timed Free Fall.] |
|
M-d6f |
Balls Shot and Dropped -- Classroom version |
A ball is dropped and simultaneously another is projected horizontally; they hit the floor at the same time. |
|
M-d6j |
Blocks Nudged and Hit |
A meter stick, fixed at one end, is bent and released to simultaneously knock blocks off the table. |
|
M-d6e |
Shoot the Monkey |
An air-gun shoots at a monkey, released when the air-gun is fired; the bullet hits the monkey in mid-air. [May conflict with Timed Free Fall or Balls Shot and Dropped.] |
|
M-d6i |
Shoot the Monkey -- Classroom version |
A shoot-the-monkey demo suitable for a normal size classroom |
|
M-d6h |
Mini Shoot the Monkey |
A minified version of the shoot-the-monkey demonstration. |
|
M-d6g |
Range of a Gun |
Shoot at 45, then calculate 30 or 60 and place the target |
|
C-2 |
Comic: Projectile Problem with Pirate |
Foxtrot Comic of doodling a pirate scenario on a projectile problem assignment |
|
C-3 |
Comic: Snowball Throw Calculation |
Foxtrot comic of getting smacked while mentally calculating snowball throw parameters |
|
M-d6k |
Parabolic Trajectory Mechanical Model |
A wooden rod with equally-spaced pendula models a parabolic trajectory. |
|
Relative Motion | |||
Moving Reference Frames | |||
M-e1a |
Crossing the River |
A battery powered tank runs at constant speed on a sheet of paper that is pulled in a direction perpendicular to the tank's velocity. |
|
M-e1b |
Movie--Frames of Reference |
Classic Movie with 20 consecutive clips of relative motion puzzles with explanations. |
|
Coriolis Effect | |||
M-e3a |
Water Stream on Rotating Platform |
Watch a horizontally-ejected stream of water falling into a pan, all mounted on a rotating platform, when the whole starts to rotate. |
|
Newton's First Law | |||
Measuring Inertia | |||
M-f1a |
Inertia vs Weight -- Balls |
Push or hit a suspended bowling ball and a styrofoam ball. |
|
Inertia of Rest | |||
M-f2a |
Inertia Masses |
A 100 g mass is suspended from a 1 kg mass which is suspended from a crossbar. A sharp downward pull breaks the lower thread; a slow pull the upper thread. |
|
M-f2d |
Tablecloth Pull |
Yank a tablecloth from under a bottle of wine, beer, and a book. |
|
M-f2b |
Hammered Blocks |
The bottommost of a stack of blocks, when struck sharply, will slide to the side while the upper blocks remain in place. |
|
M-f2e |
Card and Ball Snap |
Flick a card from underneath a ball and the ball falls into a cup. |
|
M-f2f |
Milk Bottle, Hoop, and Quarter trick |
A quarter suspended on the edge of a hoop laid vertically on top of a milk bottle falls into the bottle when the hoop is snatched away. |
|
M-f2c |
Loose Hammer Head |
The head of a hammer will remain in place when the handle is struck from above or below. |
|
Inertia of Motion | |||
M-f3a |
Glider on Level Air Track |
A glider on a level air track persists in gliding. |
|
M-f3b |
Block on a Cart |
A block is placed on a rolling cart; when the cart is stopped, the block continues. |
|
Newton's Second Law | |||
Force, Mass, and Acceleration | |||
M-g1d |
Second Law--Fan Propelled Cart |
Launch a fan-propelled (constant acceleration) cart down the track and observe what happens when its mass is varied. |
|
M-g1a |
Spring-Pulled Air Cart |
An air track glider is pulled by a spring held at constant extension. |
|
M-g1f |
Heavy Cart pulled by Spring Scale |
A cart loaded with masses is pulled by a spring held at constant extension. |
|
M-g1b |
Newton's Second Law on air track |
An air track glider whose weight can be varied is attached to one end of a spring that has its other end fixed. The glider is pulled back and released; a photogate records its transit time at one point before the glider collides with the compressed spring. |
|
M-g1g |
Cart accelerated by hanging mass (with sensors) |
A cart is accelerated by a string attached to a hanging mass; the string tension, cart position, and cart velocity are measured in real time. |
|
M-g1h |
Cart with Force and Motion Sensors - Variation 2 |
Use rubber band to launch a cart with mounted force sensor along with a motion sensor to examine the force, position, and velocity during the launch and subsequent motion. The cart mass of the cart and the spring force can be varied. |
|
M-g1e |
Spring Scale vs Pan Balance |
Show and tell a mass on a spring scale and a pair of masses on a pan balance. |
|
M-g1c |
Atwood's Machine |
Two equal masses are hung from a pulley. A small amount of mass is transferred from one side to the other. |
|
Accelerated Reference Frames | |||
M-g2b |
Elevators -- Spring and Mass |
Quickly raise and lower a spring scale loaded with a mass NEW |
|
M-g2a |
The "Anti-Gravity" Plumb Bob |
A balloon filled with helium is suspended from the bottom of a box and the box is pushed. |
|
M-g2c |
Jumping on the Trampoline |
Jump on a trampoline with an accelerometer in your pocket |
|
Newton's Third Law | |||
Action and Reaction | |||
M-h1f |
Force Sensors on Colliding Cars |
Measure the forces on each of two colliding cars, one heavy and one light, using force sensors. |
|
M-h1c |
3rd Law with Scales |
Pull on two coupled spring scales with springs of equal or unequal strength. |
|
M-h1e |
3rd Law with Bathroom Scales |
Have two students push against bathroom scales laid back-to-back to verify that each scale reads the same. |
|
M-h1a |
Push Me Pull Me Carts |
Two people stand on roller carts and both pull on a rope or push with a long stick. |
|
M-h1d |
Fan Cart with Sail |
A cart with a sail propelled by a battery powered fan shows interesting third law behavior. |
|
M-h1g |
Jumping off a Bathroom Scale |
Jump off a force-sensor equipped bathroom scale. |
|
M-h1i |
Jumping off a Cardboard Box |
A cardboard box that supports a human weight crumbles when the human jumps. |
|
Recoil | |||
M-h1b |
Tennis Ball Cannon |
A cannon mounted on an air track glider shoots out a tennis ball horizontallly. |
|
Statics of Rigid Bodies | |||
Finding Center of Gravity | |||
M-j1a |
Hanging Shapes |
Suspend a 2-dimensional shape from holes drilled near the edges, and use a plumb bob to find the center of gravity. |
|
M-j1d |
Meter Stick on Fingers |
Slide fingers together under a meter stick to come together at center of mass. Repeat with mass attached to one end of stick. |
|
Exceeding Center of Gravity | |||
M-j1b |
Photo: Pisa's Leaning Tower |
Digital image of the photo from Bloomberg's sixth floor of the Leaning Tower of Pisa. May be projected in the auditorium. |
|
M-j1e |
Tipping Block on Incline |
Raise an inclined plane until the block falls over. |
|
M-j1c |
Center of Gravity Blocks |
Stack blocks stairstep fashion at the edge of the table until the topmost block sticks out beyond the table edge. |
|
Stable, Unstab., and Neut. Equil. | |||
M-j2a |
Stable and Unstable Equilibria |
Two large rings each with two masses that have radially adjustable positions. Stable, unstable, and neutral equilibrium can be shown. |
|
M-j2f |
Weebles |
This child's toy is weighted so that it rights itself from all but one position. |
|
Stable and Unstable Equilibrium | |||
M-j2b |
Tight Rope Walker |
The Tight Rope Walker consists of a pulley with four heavy lead weights on long semi-stiff wires symmetrically mounted around it. When placed on the "rope" (Cord), the weights hang down well under the rope, leaving the center of the Walker's mass below the rope and thus making it easy for the Walker to keep its balance. |
|
M-j2c |
Tilted Pop Can |
A partially filled pop can when tilted appropriately will remain tilted |
|
M-j2e |
Balancing Bird |
The balancing bird is an example of stable equilibrium. |
|
M-j2d |
Fork on Nail |
Bend a fork so that it balances on the head of a nai |
|
Resolution of Forces | |||
M-j3a |
Suspended 3-4-5 Block |
A 1 kg mass rests on a 3-4-5 incline (e.g. incline angle = arctan(3/4)). Forces parallel and perpendicular to the incline will support the mass in mid-air when the incline is removed. |
|
M-j3h |
Mass on Board - Normal Force |
A 1 kg mass is placed on a suspended meter stick. |
|
M-j3e |
Tension in a String |
The weight of a mass hung from a spring scale is compared to the weight shown on a spring scale between two masses over pulleys |
|
M-j3d |
Four scales in a row |
A mass is hung at the end of a series of spring scales |
|
M-j3f |
Scale-Mass-Scale-Mass |
A mass is hung at the end of a series of spring scales with an intervening mass. |
|
M-j3c |
Rope and three students |
Two large strong students pull on the ends of a rope and a small student pushes down in the middle. |
|
M-j3g |
Rope, three students, pulley, and scale |
A rope is pulled taut by two students; a third pulls up on the rope with a scale moving along the length of the rope |
|
M-j3b |
Force Board |
This is a circular, ruled force table with four moveable pulleys arranged around the edge; four strings pull on a ring in the middle with masses hanging from each string. Used to show the vector sum of forces. |
|
Static Torque | |||
M-j4a |
Torque Bar |
A long thin rid mounted perpendicular to a bar handle holds a 2 kg mass on a sliding collar. |
|
M-j4d |
Wrench, Nut, and Bolt |
Use a wrench, nut, and bolt to illustrate torque. |
|
M-j4b |
Equal Arm Balance |
Combinations of weights and distances on either side of the fulcrum of the equal arm balance may be selected to produce equilibrium. An oblique arm is used to show that the effective length of the lever arm is set by the component of the force. |
|
M-j4h |
Hinged Bar Problem Demo |
Use a spring scale to lift the end of a hinged board. |
|
M-j4c |
Mass on Bar between Scales |
A horizontal beam with a sliding 1 kg mass is hung between two spring scales. |
|
M-j4f |
Roberval Balance |
A model of the Roberval platform balance. |
|
M-j4g |
Crane Boom |
A model of a crane boom, with scales to show applied forces. |
|
Applications of Newton's Laws | |||
Dynamic Torque | |||
M-k1a |
Pushing the Refrigerator |
Depending on where a large rectangular box is pushed, it will slide, tip, or turn. |
|
M-k1b |
Ladder against a Wall |
Set a ladder against the wall and walk up the rungs until the ladder begins to slide. |
|
M-k1c |
Walking the Spool |
The spool can roll forward or backwards when the string is pulled, depending on the angle of pull. |
|
M-k1e |
Walking the Spool variation 1 |
Arrange a weight and pulley to pull on the spool, and the spool will roll to equilibrium at the critical angle. |
|
M-k1f |
Pull the Bike Pedal: Tricycle |
Pulling on the pedal at its lowest position causes the bike to move in the direction of the pull. |
|
M-k1d |
Disk, Cart, Ruler slide |
Push a ruler across the top of a large disk resting on the axles of a cart frame. Which way will the cart move? |
|
Friction | |||
M-k2a |
Friction Cars on Inclined Plane |
The angle at which a cart slides down a ramp depends on the material (telfon, rubber, or wood) coating the bottom of the cart. |
|
M-k2b |
Rolling Friction -- Happy and Unhappy Balls |
Race the happy and unhappy balls down an inclined plane |
|
M-k2c |
Friction Blocks and Force Sensor |
The static and dynamic forces of teflon-coated, rubber-coated, and wooden carts are displayed by means of a force sensor. |
|
M-k2d |
Operation of a Capstan |
Demonstrate the frictional force of a capstan as the number of turns increases |
|
Pressure | |||
M-k3a |
Bed of Nails |
Lie down on a bed of nails. |
|
Gravity | |||
Univ. Gravitational Constant | |||
M-L1a |
Movie: Cavendish Balance |
Time lapse of the Cavendish Experiment on Videodisk. |
|
Orbits | |||
M-L2a |
Gravitational Well |
A large fiberglass vortex-shaped cone is used to show circular and elliptical orbits and conservation of angular momentum. |
|
M-L2g |
Ball Orbiting inside Cone |
A large glass cone is used to show circular and elliptical orbits, conservation of angular momentum, and the speed-height paradox. |
|
M-L2c |
Satellite Launch Applet |
Animation launching a satellite tangentially to earth surface, as function of velocity: http://www.phy.ntnu.edu.tw/ntnujava/msg.php?id=47 |
|
M-L2e |
Movie: Motion of Attracting Bodies |
Meeks' animated 1976 film (6:53 min) on Newton's Laws and Earth's Gravity |
|
M-L2b |
Styrofoam cup -- conic sections |
A cone is cut in circular, elliptical, parabolic, and hyperbolic cross sections. RETIRED |
|
M-L2h |
3D Printed -- Conic Sections |
A cone is cut in circular, elliptical, parabolic, and hyperbolic cross sections. |
|
M-L2d |
Animation: Kepler's Laws Applet |
Animation illustrating Kepler's first, second, and third laws: http://www.phy.ntnu.edu.tw/ntnujava/viewtopic.php?t=25 |
|
M-L2f |
Movie: Planetary Motion and Kepler's Laws |
Meek's 1974 animated film (9:22 min) on planetary orbits and Kepler's Laws |
|
Work and Energy | |||
Work | |||
M-m1a |
Pile Driver |
Drive a nail into a block of wood with a pile driver. |
|
Simple Machines | |||
M-m2a |
Simple Pulley |
Show a simple pulley in equilibrium |
|
M-m2b |
Compound Pulley |
Weights of a proportion of 5-to-1 are the equilibrium conditions for this compound pulley. |
|
M-m2e |
Double Pulley Setup |
A 500g mass balances a 1000g mass in a two pulley system; can show that the work done by each in moving is the same. |
|
M-m2d |
Bosun's Chair -- Single Pulley |
Subject in harness with attached rope that flows through overhead pulley, pulls self up with a force equal to half subject's weight. |
|
Work-Energy Theorem | |||
M-m2c |
Spring Launched Cart on Level Track |
A spring (of measurable spring constant) launches a cart (with measurable final veloctiy) on a level air track. Mass of cart can be varied. |
|
Non-Conservative Forces | |||
M-m3a |
Decelerated Pendulum Rider |
A pendulum hits a level board, transferring a mass rider that slides to a stop. |
|
Conservation of Energy | |||
M-m4a |
Bowling Ball Pendulum--Energy Conservation |
A bowling ball pendulum is pulled back until it touches the lecturer's nose and let go. The lecturer does not move. |
|
M-m4b |
Galileo's Pendulum and Nail |
A pendulum started at the height of a reference line reaches the same height when its swing is intercepted by a post that effectively shortens the length of the pendulum. |
|
M-m4n |
Pendulum catch trick |
A string with one hex nut at one end and 15 at the other is held by the single hex nut, with the rest of the string lying over a finger of the other hand. Release the nut. From Steve Spangler. |
|
M-m4c |
Loop the Loop |
A rolling ball must be released from a height equal to 2.7 times the radius of the loop. |
|
M-m4d |
Ballistic Pendulum with Gun |
A ball is shot out of a fixed, spring-powered gun into a pendulum which traps the ball. |
|
M-m4e |
Spring Launched Air Cart |
Predict the height to which a spring-compressed glider will rise on an inclined air track given the mass, spring constant, and amount of spring compression. Do the experiment. |
|
M-m4f |
Spring-Launched Rolling Cart |
Predict the height to which a spring-compressed cart will rise on an inclined plane given the mass, spring constant, and amount of spring compression. Do the experiment. |
|
M-m4h |
Ping-Pong Slingshot |
Shoot Ping Pong Balls at unbelievers in energy conservation. |
|
M-m4k |
Toys - Jumping |
A spring-loaded object (jumping disk; jumping frog) can often jump many times its own height. |
|
M-m4m |
Rollback Can |
A rubber band with attached mass winds up when the can is rolled, causing the can to roll back as the rubber band unwinds. |
|
M-m4g |
Rattleback |
The rattleback, or celt, will slow down and reverse direction when rotated against its preferred rotational direction. |
|
M-m4j |
Hopper Popper |
The hopper popper will store and release energy. |
|
M-m4i |
Movie: Honda Cog |
Two-minute Honda movie ad of a series of mechanical cogs bumping into each other in sequence. http://www.youtube.com/watch?v=EEF0cg1j35 |
|
M-m4l |
Movie: OK Go - This Too Shall Pass (Rube Goldberg Machine) |
Rube Goldberg type sequence of collisions set to "This too Shall Pass" at http://www.youtube.com/watch?v=qybUFnY7Y8w |
|
Linear Momentum and Collisions | |||
Impulse and Thrust | |||
M-n1c |
Measuring Impulse with Force Sensor |
A force sensor mounted on a cart collides with a barrier, and different force vs. time curves are obtained when the cart bumper is changed. |
|
M-n1a |
Lacrosse Ball Compression/Impression |
Drop a lacrosse ball on down-ward facing carbon paper, and then press down on the ball until it is squashed the same amount. |
|
M-n1b |
Egg in sheet |
Throw an egg into a sheet held by two people. |
|
Conservation of Linear Momentum | |||
M-n2d |
Spring apart air track gliders |
Cut a string between two air track gliders compressed by a spring. Either 150g carts, 300g carts, or one of each can be used. |
|
M-n2c |
Spring apart Pasco carts |
Tripping the spring between two Pasco carts launches them in opposite directions; the cart masses may be varied. |
|
M-n2f |
Spring apart Vernier carts with Magnets |
Hold the two carts gether, and then release them; the cart masses may be varied. |
|
Rockets | |||
M-n2a |
Fire extinguisher wagon |
Mount a fire extinguisher on a cart and take a ride. |
|
M-n2j |
Alcohol Vapor Rocket |
The combustion of alcohol vapor propels a 5 gallon whoosh bottle across the stage. |
|
M-n2b |
Water Rocket |
A toy rocket is launched twice, once when pumped up with air and once when pumped up with water. |
|
M-n2g |
Rocket Car -- Vinegar and Baking Soda |
Vinegar and Baking Soda combine to blow out the stopper and propel this rocket car. Vinegar & Soda not shown. |
|
M-n2h |
Two Litre Bottle Rocket -- Air Pressure |
Use a bicycle pump to pressurize a 2L bottle; pull the catch to release. |
|
M-n2i |
Foot Long Rocket -- Air Pressure |
Use a bicycle pump to pressurize this rocket; pull the catch to release. |
|
M-n2k |
Ball Bearing Rocket Car |
A cart accelerates as each ball rolls off. |
|
M-n2e |
Sparkler Sprinkler |
A sprinkler-shaped configuration of two sparklers rotates with lit. |
|
Collisions in One Dimension | |||
M-n3a |
Newton's Cradle |
Five adjacent metal balls on a bifilar suspension illustrate momentum conservation properties. |
|
M-n3c |
Elastic Collisions on Air Track |
Elastic collisions between air track gliders of equal and/or unequal mass. |
|
M-n3d |
Inelastic Collisions on Air Track |
Inelastic collisions between air track gliders of equal and/or unequal mass. |
|
M-n3g |
Happy and Unhappy Ball Collisions |
A happy ball rolls down the incline and knocks the block over; the unhappy ball does not. |
|
M-n3e |
Supernova |
A tennis ball is placed on top of a basketball and both are released from rest. |
|
M-n3f |
Astroblaster |
Four balls of progressively smaller diameter resting on top of one another are dropped to the floor. |
|
Collisions in Two Dimensions | |||
M-n4a |
Air Table |
Can use to illustrate the properties of momentum in two dimensions with these pucks that glide freely over an air table. |
|
Rotational Dynamics | |||
Moment of Inertia | |||
M-q1a |
Inertia Wands |
Students twirl equal mass wands, one with the mass concentrated in the middle, the other with the mass concentrated at the ends. |
|
M-q1b |
Ring versus Disk Race |
The Matched Disk and Ring are identical in diameter and mass. When rolled down the inclined plane, the disk wins the race due to its lower moment of inertia. |
|
M-q1c |
Racing Disks |
Two disks of identical mass, one weighted in the center and the othe weighted at the rum, are rolled down an incline. |
|
M-q1d |
Racing cylinders |
3 Cylinders of identical mass and appearance accelerate down an incline at different rates. |
|
M-q1e |
Racing cylinders -- different mass |
Yet another set of disks to race, including cylinder pair of uniform density but different mass. |
|
M-q1g |
Video - Tire Ski Jumping |
Video of a Japanese test of the jumping and rolling performance of six different tires. |
|
Rotational Energy | |||
M-q2a |
Whirlybird |
Two equal masses with adjustable positions are mounted on a radial bar fixed to a horizontal axis with a pulley. A weight on a string rotates the assembly. |
|
M-q2d |
Instrumented adjustable whirlybird |
Two equal masses with adjustable positions are mounted on a radial bar fixed to a verticle axis with a pulley. A weight on a string traveling over a Vernier smart pulley enables the radial position and velocity to be measured. |
|
M-q2b |
Massive Atwood's Machine |
Atwood's machine with a large, massive pulley. |
|
M-q2g |
Block-and-Spool Atwood's Machine |
Atwood's machine comparing a weight and an unraveling spool of the same mass. |
|
M-q2f |
Block and Spool Race |
A wrapped spool and an unwound spool are each simultaneously accelerated from rest across an air-table by equal-mass falling weights. Which wins the race? |
|
M-q2c |
Toppling Chimney |
A column of two sticks, one on top of the other, is pushed until it topples |
|
M-q2e |
Free Fall Paradox |
A ball at the opposite end of a hinged stick falls into a cup. |
|
Transfer of Angular Momentum | |||
M-q3a |
Disc Dropped on Rotating Disk |
Drop a stationary disk on top of a rotating disc. |
|
Conservation of Angular Momentum | |||
M-q4a |
Rotating Platform and Weights |
Spin on a rotating platform with a dumbbell in each hand. |
|
M-q4b |
Swinging Bat on Rotating Platform |
Stand on a rotating platform initially at rest, and swing a bat or a mallet. |
|
M-q4f |
Collapsing Star |
Collapse a spinning suspended Hoberman Sphere into a small ball. |
|
M-q4c |
Bike wheel on rotating platform |
Invert a spinning bicycle wheel while standing on a rotating platform. |
|
M-q4d |
Rotating Platform and Mallet |
Rotate yourself one full revolution using a mallet. |
|
M-q4g |
Train on Circular Track |
A train rides on a circular track mounted to a rotating platform. [M-q4k works much better] |
|
M-q4k |
Car on freely spinning disk |
A remotely controlled car rides on a freely-rotating platform. |
|
M-q4e |
Angular Momentum Funnel |
The angular speed of a ball bearing increases as it approaches the bottom of a large glass funnel. |
|
M-q4i |
Angular Momentum Vortx |
The angular speed of a quarter or steel ball increases as it rotates through ever-smaller circles down the Vortx. |
|
M-q4h |
Balloon Helicopter |
A balloon is attached to a Hero's engine-type arrangement of wings |
|
Gyros | |||
M-q5f |
Throwing Top |
A classic throwing top |
|
M-q5a |
Precessing Disk |
Spin a metal disk on a nail inserted in a central hole and touch a finger to the rim. [Broken] |
|
M-q5b |
Toy Gyroscope |
The toy gyroscope has a knob on the end of an axis that fits into a hollow in a separate mound. Useful demo for a small classroom. |
|
M-q5c |
Bicycle Wheel Gyro |
The bike wheel is hung from its axle by a wire attached to the ceiling; when spun the bike wheel illustrates gyroscope motion nicely. |
|
M-q5g |
Double Bike Wheel Gyro |
Two bike wheels are mounted coaxially; when wheels spin in opposite directions the gyroscopic effect disappears. |
|
M-q5d |
MITAC Gyroscope |
This motorized gyroscope, used in the teaching labs, is good for showing a gyroscope's directional constancy; precession due to applied torques, and nutation. |
|
M-q5e |
Gimbaled Gyroscope |
An old aircraft navigational gyroscope that spins fast and shows the gyroscope's ability to maintain its orientation in space |
|
Rotational Stability | |||
M-q6d |
Perpetual Top |
This top will keep spinning until the battery runs out. |
|
M-q6b |
X-zyLo the Flying Gryo |
A slender collar is spun as it is launched |
|
M-q6a |
Good, Bad, and Giant YoYos |
Comparison between well and poorly designed yoyos |
|
M-q6f |
Euler's Disk |
Euler's disk dissipates a minimum of energy and momentum as it spins; the spin ends in a finite-time singularity. |
|
M-q6c |
Tippe Top |
The tippe top flips when it spins. |
|
M-q6e |
Whirling Spiral Toy |
This toy whirls with more stability when its arms are spread out compared to when the arms are aligned. Esoteric |
|
Properties of Matter | |||
Hooke's Law | |||
M-r1a |
Stretching a Spring: Hooke's Law |
Add masses to a spring and measure displacement. |
|
M-r1b |
Stretching a Horizontal Spring: Hooke's Law |
Use a spring scale to pull on a mass attached to an airtrack by a spring. |
|
Tensile and Compressive Stress | |||
M-r2a |
Breaking Wire |
Suspend a wire from the ceiling and add masses until the wire breaks. |
|
M-r2b |
Young's Modulus |
Hand weights from a wire, and use a laser and mirror-mounted-on-lever to display the elongation. |
|
M-r2c |
Poisson's Ratio with rubber tube |
The striped tube can be stretched to show lateral contraction with increasing length. |
|
M-r2d |
Bend the Wall |
Push on a concrete wall and the wall's deflection is detected by the deflection of a laser beam |
|
M-r2e |
Bend the Table |
Stand on the demo table and show the tabletop deflection by the dispalcement of a laser beam. |
|
Shear Stress | |||
M-r3a |
Deformation of Thick Book |
The large book can be pushed perpendicular to the spine to show shear. |
|
M-r3b |
Striped Tube Twist |
The striped tube can be twisted to show torsion. |
|
Coefficient of Restitution | |||
M-r4b |
Atomic Trampoline |
Compare a steel ball bouncing on an amorphous metal to one bouncing on stainless steel. |
|
M-r4a |
Happy and Unhappy Balls |
Two black rubber balls of about 1.5 cm diameter are dropped from a height simultaneously. One ball bounces high while the other barely rebounds. Great to pass around. |
|
Crystal Structure | |||
M-r5a |
NaCl crystal model |
NaCl model made of wooden balls connected by metal sticks. |
|
M-r5b |
Ball and Spring crystal model |
Cubic crystal model made of plastic balls connected by springs. |
|
M-r5c |
BB Board -- Crystal Faults Model |
A layer of spheres sandwiched between clear acrylic panels illustrates slip planes, grain boundaries, and vacancies. |
|
Fluid Mechanics | |||
Surface Tension | |||
Force of Surface Tension | |||
F-a1a |
Floating Metals |
Float a razor blade, a paperclip, and a needle on the surface of water. |
|
Minimal Surface | |||
F-a1b |
Ring and Thread |
A loop of thread inside a soap film forms a circle when the film interior to the loop is popped. |
|
Capillary Action | |||
F-a2a |
Capillary Tube |
Compare the height of water in different diameter tubes |
|
Statics of Fluids | |||
Static Pressure | |||
F-b2a |
Pascal's Vases |
Tubes of different geometries rise vertically out of a common reservoir of colored water. |
|
F-b2f |
Hydraulic Press |
Break a piece of wood in a hydraulic press. |
|
F-b2b |
2L Bottle Hydraulic Press |
Push up a quarter (mass ~2 grams) with a 0.5cm diameter tube, then attach to the cutoff 2L bottle (dia. ~ 10 cm) and lift up a soda bottle (~ 800 grams) |
|
Atmospheric Pressure | |||
F-b3c |
Crush the Can--water condensation |
Heat water in a can until boiling, then cap and remove from heat. |
|
F-b3d |
Indent the Can--cooling of air |
Heat the air inside the can until it's hot, cap, and remove from heat. |
|
F-b3a |
Crush the Can--with pump |
A vacuum pump evacuates a 1 gallon can; atmospheric pressure crushs the can. |
|
F-b3j |
Vacuum Pack a Student |
A plastic bag covering a student up to the neck is evacuated with a vacuum cleaner. |
|
F-b3b |
Magdeburg Disks |
Evacuate Magdeburg hemispheres and try to separate them. |
|
F-b3f |
Magdeburg Disks -- Hanging from Ceiling |
The space between two plates is evacuated; one plate hangs from the ceiling and a person sits on a seat attached to the other. |
|
F-b3h |
Suction Cups |
Press together two suction cups and try to pull them apart. |
|
F-b3k |
Inverted Glass surprise |
Fill a glass part way with water, cover with a stiff card, and invert. |
|
F-b3i |
Egg in a Bottle |
Put a lighted match inside a milk bottle and cover with a peeled hard-boiled egg. |
|
F-b3g |
Lift with Rubber Sheet |
A stool is lifted by means of a rubber sheet with a handle lain on top. |
|
F-b3e |
Vacuum Ping Pong Ball Cannon |
Atmospheric pressure shoots a ping pong ball through an aluminum can. |
|
Density and Buoyancy | |||
F-b4a |
Weigh Submerged Block |
A 2 kg Al cylinder, 0.707 L in volume, suspended from the 20 N spring scale, is lowered into water. Can have beaker on scale; Can lower into oil for comparison |
|
F-b4g |
Finger in Water |
Ask what will happen when a finger is inserted into a beaker of water balanced on a pan balance. |
|
F-b4h |
Sulfurhexafluoride Boat |
An aluminum boat floats on a sea of Sulfur Hexafluoride gas |
|
F-b4f |
Ice Melting in Water |
Show that the water level doesn't change when the ice in a beaker of ice water melts. |
|
F-b4b |
Cartesian Diver - Squidy |
Squeeze the bottle to sink the diver. |
|
F-b4d |
Coke and Diet Coke |
An unopened diet soda can floats in water, and a regular soda can sinks. |
|
F-b4i |
Sulfurhexafluoride Balloon |
A SF6-filled balloon falls to the floor with a thud. |
|
F-b4c |
water and oil "U" tube |
Water and oil rise to different heights in a "u" tube. |
|
F-b4e |
Floating Balloons |
Helium filled ballons trailing masses float without rising or sinking. |
|
F-b4k |
Hot Air Balloon |
Use a hair dryer to launch this hot air balloon. |
|
F-b4m |
Solar Bag |
Blow up this bag, tie it down with string, place it out in the sun, and watch it rise. |
|
F-b4j |
Asphyxiation of flame by CO2 |
Pour gaseous carbon dioxide over a flame to extinguish it |
|
F-b4n |
Flame climbing ether in trough |
Vapor from an ether-soak rag drifts down a trough at the bottom of which is a candle flame. |
|
Siphons, Fountains, Pumps | |||
F-b6a |
Cup of Pythagoras |
A clay drinking vessel designed to empty itself when filled beyond a certain level. |
|
Dynamics of Fluids | |||
Flow Rate | |||
F-c1a |
Torricelli's Tank |
Water streams out from three holes at different heights in a tall cylinder. |
|
Forces in Moving Fluids | |||
F-c2a |
Venturi Flowmeter |
Air flows through a restricted glass tube to the atmosphere; the pressure at different points of the tube is shown by manometers. |
|
F-c2d |
Windbag |
Blow up an 8-foot long bag with one breath. |
|
F-c2b |
Floating Ping Pong Ball |
A ping pong ball floats in an upward stream of air. |
|
F-c2h |
Floating Beach Ball |
A beach ball ball floats in an upward stream of air. |
|
F-c2i |
Toilet Paper Cannon |
Send streamers of toilet paper some dozens of feet into the air. |
|
F-c2c |
Funnel and Ball |
A ping-pong ball is supported by air streaming out of an upside down funnel. |
|
F-c2k |
Fan blowing on Board |
A fan blows on a board mounted so that it can rotate about an axis in the wind. What orientation will the board take? |
|
F-c2L |
Falling Card |
Hold one of these cards horizontally in the air, and then drop one to observe the dominate behavior of the card orienting itself horizontally, as well as the slipping and rotating behavior believed due to turbulence. |
|
F-c2g |
Bernoulli Paper Lift |
Raise a strip of paper by blowing just above its surface |
|
F-c2j |
Lifting Plate - Spool and Card |
Stick a pin in a card, insert into a spool, and blow through the other end to lift the card. |
|
F-c2f |
Curving Baseball |
A relatively complicated apparatus that holds and spins a ping pong ball and has an attachment to hit the ball, resulting in a curved trajectory. |
|
F-c2m |
Launch of rotating cylinder |
Wind a rubber strip around a cylinder, pull, and launch into an aerodynamically influenced trajectory. |
|
F-c2e |
Ping Pong Ball and Racket |
Use a ping pong racket to hit a curve ball using a 2-3" diameter styrofoam ball or a ping pong ball. |
|
F-c2n |
Spitball in Bottle Mouth |
Place a crumbled paper ball in the mouth of a two litre bottle and attempt to blow the ball into the bottle with a straw. |
|
Viscosity | |||
F-c3a |
Ball Drop in Oil |
A steel ball is dropped into a tall cylinder filled with water and then with corn syrup. |
|
F-c3b |
terminal velocity--coffee filters |
Drop a coffee filter and it descends at a low terminal velocity. Crumble it and it free falls. |
|
F-c3c |
Coffee Filter Drop |
One coffee filter dropped from one meter and four coffee filters dropped from 2 meters hit the ground at the same time, demonstrating that the drag force is proportional to the square of the velocity |
|
Turbulent and Streamline Flow | |||
F-c4d |
Swimming in Corn Syrup Movies |
Three movies showing a flap-drive in water, flap-drive in corn syrup, and corkscrew-drive in corn syrup, from Youtube. |
|
F-c4b |
Laminar Flow in Microfluidics Card |
Observe water flow laminarly in a microfluidic circuit. |
|
F-c4a |
Couette Flow |
Observe a drop of dye suspended in corn syrup or glycerin spread out as the outer cylinder is rotated with respect to the concentric inner cylinder, and return to a drop when the rotation is reversed. |
|
Vorticies | |||
F-c5a |
Vortex Cannon |
Pull and release the plastic diaphragm to blow vortexes; add smoke to blow smoke rings. |
|
Non Newtonian Fluids | |||
F-c6b |
Fluidization of Sand |
A column of sand behaves like a fluid when air flows through the column under pressure |
|
F-c6a |
Corn Starch in Water -- Oobleck |
Add water to cornstarch to make a gooey, non-Newtonian fluid |
|
Oscillations and Waves | |||
Oscillations | |||
Pendula | |||
W-a1a |
Simple Pendulum |
A bob on a string hanging from a stand exhibits simple harmonic motion for small angles. |
|
W-a1g |
Force Sensor as Pendulum Bob |
The Vernier WDSS as a pendulum bob shows the force on the bob as a function of altitude. |
|
W-a1h |
Human Pendulum--Mass of Bob |
First swing the bowling ball pendulum, then replace the bowling ball with the lecturer to demonstrate the dependence of the period on the mass of the bob. |
|
W-a1b |
4-to-1 Pendula |
One pendulum four times longer than a second oscillates with twice the period of the second. |
|
W-a1c |
Different mass pendula |
Three pendula of different masses but the same length all oscillate with the same period. |
|
W-a1f |
Inverted Pendulum |
A piece of spring steel mounted vertically from a heavy base with a mass on the end behaves like a two level system. |
|
W-a1d |
Torsion Pendulum |
A steel cylinder is suspended by a steel music wire along its right axis. When the cylinder is displaced by rotation and released it will oscillate in simple harmonic motion. |
|
W-a1e |
Pendula Amplitude Dependence |
Two identical simple pendula set in motion with different initial amplitudes, oscillate nonisochronically. |
|
Physical Pendula | |||
W-a1p |
Physical Pendulum--Crossed Dumbbells |
A physical pendulum of cross dumbbells with adjustable positions can be used to show the inertia effects and center of gravity effects. |
|
W-a1q |
Physical Pendulum - 1 meter bar |
A meter stick pendulum is set swinging together with a 1 meter simple pendulum and a 2/3 meter simple pendulum. |
|
W-a1r |
Dueling Pendula |
When a meter stick pendulum and a 1 meter simple pendulum are release from a horizontal position, which reaches the bottom of the swing first, and which has a higher velocity at the bottom? |
|
W-a1s |
Pendulum bob free to rotate |
Compare two pendula with large bobs, one free to rotate about the bob's axis, and one not. May also compare to a simple pendulum of same length. |
|
Springs and Oscillators | |||
W-a2a |
Spring and Weight |
A mass hangs on the end of a spring. Using two springs of different k and a variety of masses, show the effect of varying k and m. |
|
W-a2f |
Oscillating Human |
The lecturer oscillates on a spring suspended from the catwalk |
|
W-a2d |
Springs in Series and Parallel |
A spring with mass m, two identical springs in parallel with mass 2m, and two identical springs in series with mass m/2 oscillate with the same period. |
|
W-a2g |
Series and Parallel Springs with Human |
Analog to Springs in Series and Parallel, but using a human as the bob and stronger springs. |
|
W-a2c |
Air track glider and Spring |
Two identical air track carts are attached to (opposite) ends of an air track by means of two different springs. A mass may be added to either cart, and the dependence of the oscillation frequency on mass and on spring constant may be explored. |
|
W-a2e |
Glider and Spring with Motion Detector |
A motion detector enables the time dependence of a glider's position, velocity, and acceleration to be displayed. |
|
W-a2b |
Horizontal Mass and Spring (wheeled cart with sensors) |
An air track glider is attached to a horizontal spring and displaced from equilibrium. |
|
Simple Harmonic Motion | |||
W-a4a |
Projected SHM |
Shadow project a ball mounted on a rotating disk. |
|
W-a4b |
Projected SHM Applet |
Java Applet relating circular motion to a mass on a spring: http://www.phy.ntnu.edu.tw/ntnujava/viewtopic.php?t=13 |
|
Driven Mechanical Resonance | |||
W-a6a |
Tacoma Narrows Film |
A 3 minute video of the collapse of the Tacoma Narrows Bridge. Very impressive and memorable. |
|
W-a6d |
Film: Puzzle of the Tacoma Narrows Bridge Collapse |
The expanded 8.21 minute, 1979 version of the Tacoma Narrows Bridge Collapse, with additional context and detail. |
|
W-a6b |
Driven Cart Between Springs |
An air track glider attached by springs to a mechanical oscillator, is swept through resonance. |
|
W-a6c |
Damped Driven Hanging Mass |
A mass, supported by a spring whose support is driven, vibrates against a solid screen; the drive amplitude, frequency and the screen angle can be varied. |
|
W-a6f |
Damped Driven Hanging Mass--Showing Beats |
The beats between the natural oscillation frequency and the driving frequency of a damped driven hanging mass are illustrated by using a force sensor between the driving system and the hanging mass. |
|
W-a6e |
Vibrations of Metal Strips |
A mechanical vibrator drives a metal comb with different length tines through resonances. |
|
Coupled Oscillations | |||
W-a7a |
Wilberforce Pendulum |
Illustrates the transfer of energy between torsional and vertical oscillation modes. |
|
W-a7b |
Coupled Pendula |
Two pendula are coupled with a light spring. |
|
Normal Modes | |||
W-a7c |
Two Coupled Air Track Gliders |
Two air track gliders are coupled with three identical springs. |
|
W-a7d |
Five Coupled Driven Air Track Gliders |
Up to five air track gliders are coupled by identical springs driven at the normal mode frequencies. |
|
W-a7e |
Vibrating String with evenly spaced masses |
Show normal vibrational modes of a "massless" string with up to six equally spaced masses. |
|
Lissajous Figures | |||
W-a8a |
Lissajous Figures - Fourier Synthesizer and Scope |
Harmonics of the Fourier Synthesizer's 440Hz fundamental are fed into the X and Y channels of an oscilloscope. |
|
W-a8b |
Lissajous Figures - Dual Function Generator |
The outputs of the dual function generator are fed into the X and Y channels of an oscilloscope. |
|
Non-Linear Systems | |||
W-a9k |
Amplitude Jumps |
An air cart is driven between two springs. A magnet on top interacts with other magnets to perturb the potential and produce the jump effect. |
|
W-a9m |
Chaotic/Anharmonic Pendulum |
A physical pendulum made of a ruler blade oscillates between between two disk magnets. This is a modification of a pendulum in the advanced lab. |
|
W-a9n |
Two Uncoupled, Physical Double Pendula |
Two uncoupled, physical double pendula, each having one bob hanging from an upper bob, are used do demonstrate chaos. |
|
W-a9o |
Gee Haw Whammy Diddle |
Rub a dowel along a ribbed stick with an attached propeller makes the propeller go round. |
|
Wave Motion | |||
Transverse Pulses and Waves | |||
W-b1a |
Pulse on 1.9m spring |
Give the 1.9 m spring a quick pulse. The length and/or tension in the spring can be varied. Good for showing pulses, standing waves, harmonics, energy transfer. |
|
W-b1b |
Pulses on Torsional Wave Apparatus |
Excite the short-bar and long-bar torsional wave machines by hand to show how the wave speed varies as the inertia of the medium (the rod length) varies. |
|
W-b1c |
Simple Reflections--Torsional Wave Apparatus |
Send pulses down a torsional wave machine with two internal interfaces and two ends that can vibrate freely, be fixed, or attach to a dash pot. |
|
W-b1d |
Pendulum Waves - Overhead Projector Version |
A set of eight uncoupled pendula of monotonically increasing length that exhibit traveling waves, standing waves, and interesting patterns. |
|
Longitudinal Pulses and Waves | |||
W-b2a |
Hanging Slinky |
A long slinky is supported on a bifilar suspension, and the ends are taped to the lab stands, for showing longitutinal wave properties with minimal friction. [BROKEN] |
|
W-b2b |
Slinky |
Two students stretch a slinky and send longitudinal waves down the slinky. |
|
Standing Waves | |||
W-b2e |
Driven Rope Waves |
A horizontal rope with a mechanical vibrator at one end and a weight over a pulley at the other end is used to show standing waves at different driving frequencies. [Needs Fixing] |
|
W-b2f |
Standing Waves on a String |
Use a mechanical vibrator to generate standing waves on a string with one end under tension from a hanging mass. Best under UV light |
|
W-b2g |
Standing Waves on torsional wave machine |
Excite standing waves on the torsional wave machine by hand |
|
W-b2h |
Simulation: Standing Waves on torsional wave machine |
Simulation illustrating forbidden bands and standing waves specific to the torsional wave machine. http://www.pha.jhu.edu/~javalab/wavemachine.html |
|
W-b2i |
Standing Waves in Air - Schlieren View |
Observe the formation of 28kHz standing waves in the cavity between a speaker and reflector. Small balls may also be levitated. |
|
Inpedance and Dispersion | |||
W-b2L |
Coupling with Impedance Matching - Shive Machine |
Waves emanating from the short-rod torsional machine are transmitted with minimal reflection to the long-rod machine when a third section of gradually tapering rods is inserted between them. |
|
W-b2n |
Reflection and Transmission at media boundaries--Shive Machine |
See the incident, reflected, and transmitted waves at the interface of the short- and long-rod sections of the torsional wave machine. |
|
W-b2k |
Joined spring and cord |
The 1.9 m spring is attached to a rubber cord; pulses started at one end will produce both transmitted and reflected pulses. |
|
W-b2m |
Pulse over trough edge |
A slinky lies in a tilted channel raised above the table; pulling one point of the slinky onto the table causes a pulse to propagate along the channel, in mechanical analog to nerve conduction along axons. |
|
Compound Waves | |||
W-b2r |
Wave Superposition -- Torsional Wave Apparatus |
Send pulses simultaneously from both ends of one section of the torsional wave machine. |
|
W-b2p |
Wave Superposition--Long Spring |
Send pulses simultaneously down both ends of the 1.9 m spring to show the addition of amplitudes. |
|
W-b2q |
Wave Superposition -- on scope |
Electronically add two 440 Hz sine waves of different phases together on the scope and audibly. |
|
Wave Properties of Sound | |||
W-b3d |
Speed of Sound by Phase Difference |
A function generator drives a speaker, and an oscilloscope displays the signals from the function generator and a microphone that moves radially from the speaker. |
|
W-b3a |
Bell in a Vacuum |
An alarm buzzer is suspended inside an evaculated bell jar, turned on, and the bell jar is evaculated. When air is let back into the jar, the sound returns. |
|
W-b3c |
Speaker and Candle |
A large speaker operating at low frequency and large amplitude makes a candle flame oscillate. |
|
W-b3b |
Helium voice (or recorder) |
Fill your lungs with helium and then talk, sing, or blow a musical instrument. |
|
W-b3g |
SF6 voice (or recorder) |
Fill your lungs with sulfer hexafluoride and then talk, sing, or blow a musical instrument. |
|
Phase and Group Velocity | |||
W-b3f |
Wave and Group Velocity on Scope |
Display the signals from two oscillations and their sum on the oscilloscope |
|
W-b3e |
Two Combs |
Slide two combs across each other on the overhead projector |
|
Reflection and REfraction (Sound) | |||
W-b3h |
Refraction of Water Waves |
Observe refraction and wave velocity differences between plane waves traversing deep and shallow sections in the ripple tank. |
|
Doppler Effect | |||
W-b4a |
Doppler Buzzer |
Swing a small battery powered buzzer on the end of a string in a circle over your head. |
|
W-b4b |
Doppler in Ripple Tank |
Move the wave generator back and forth in the ripple tank. |
|
W-b4d |
Movie--The Doppler Effect in Sound and Light |
Computer-animated film by Meeks, 5 min 50 sec in duration, on DVD. |
|
W-b4c |
Doppler with Stroked Aluminum Rod |
Shake the stroked aluminum rod at the audience |
|
Shock Waves | |||
W-b4e |
Photo of jet with vapor cone |
Photograph of Airplane creating vapor cone shock wave |
|
Interference and Diffraction | |||
W-b5a |
Single Slit in Ripple Tank |
Diffraction from a plane wave passing through a single slit on the ripple tank mounted on the overhead projector. |
|
W-b5c |
Two Points in Ripple Tank |
Two point source generators of ripples show interference patterns in the ripple tank on the overhead projector. |
|
W-b5d |
Double Slits in Ripple Tank |
A plane wave impinges on a barrier with two slits in the ripple tank on the overhead projector. |
|
W-b5b |
Moire Pattern Transparancies |
Transparancies with identical concentric circular patterns are placed on top of each other with a slight offset. |
|
Interference and Diffraction of Sound | |||
W-b5e |
Two-Speaker Bar |
A 2 meter long bar with a speaker at each end produces auditory interference patterns. |
|
W-b5g |
Two Speakers and Microphone |
A moveable, free-standing microphone attached to an oscilloscope picks up the interference pattern produced by two identically-driven speakers. |
|
W-b5f |
Baffle and Speaker |
Listen to a single bare speaker, then surround it by a baffle. |
|
Beats | |||
W-b6a |
Beats with Tuning Forks |
Two tuning forks of identical frequency are mounted on resonant enclosures; when a small piece of wax is attached to one, beats can be heard. |
|
W-b6c |
Beats with Tuning Forks and Oscilloscope |
Examine with an oscilloscope the beats from two identical tuning forks mounted on resonant enclosures. |
|
W-b6b |
Beats on Scope |
Two audio signals are fed through a summing amplifier and the result is presented on the oscilloscope and a speaker. |
|
W-b6d |
Beats on Scope with Fourier Synthesizer |
Use two higher overtone frequencies of the Pasco Fourier synthesizer to produce and hear beats. |
|
Coupled Resonances | |||
W-b7a |
Coupled Tuning Forks |
Strike one of two matched tuning forks mounted on resonant boxes and the other vibrates too. |
|
Acoustics | |||
Pitch | |||
W-c1a |
Range of Hearing |
Use a function generator and wide-range speaker to demonstrate the range of hearing. |
|
Wave Analysis and Synthesis | |||
W-c5a |
Pasco Fourier Synthesizer |
Construct, hear, and see waveforms built from the 440 Hz fundamental and up to eight harmonics. |
|
W-c5d |
Java Fourier Synthesizer NTNU |
Construct, hear, and see waveforms built from up to fifteen harmonics: http://www.phy.ntnu.edu.tw/java/sound/sound.html |
|
W-c5e |
Java Fourier Synthesizer Falstad |
Construct, hear, and see waveforms built from up to over a hundred harmonics: http://www.falstad.com/fourier/j2 |
|
W-c5f |
Java Fourier Synthesizer Thole-Huber |
Construct any waveform by specifying numerically up to 13 fourier components or inputing the analytical expression, and hear and see the resulting waveforms. built from up to over a hundred harmonics: http://homepages.gac.edu/~huber/fourier/ |
|
W-c5b |
Fourier Analyzer - Oscilloscope |
Use the FFT module of the Tektronix TDS3014 oscilloscope to examine the waveform and spectrum of sound waves. |
|
W-c5h |
Fourier Analyzer - LabPro |
Use the LabPro with Logger Pro software to acquire and display the waveform and FFT from various sound-making instruments |
|
W-c5c |
Resolution of Fourier Analyzer - Oscilloscope |
The width of the Fourier transforms depends on the length of the wave being analyzed and limits the resolution of the spectrum. |
|
W-c5g |
FFT Properties- LabPro and Falstad Synthesizer |
Demonstrate data & FFT transform decreteness, (data length)(width of FFT peak) uncertainty, and aliasing using the LabPro FFT program and Falstad function generator or musical instrument |
|
W-c5i |
FFT of Boxcar Pulse |
Use the Tektronix FFT function and a pulse generator to show the Fourier Transform of a square wave pulse. |
|
Instruments | |||
Resonance in Strings | |||
W-d2a |
Guitar |
Hanging weights on the end of a "guitar" can be varied to "tune" the guitar to a desired pitch. |
|
Resonant Cavities | |||
W-d3a |
Resonant Tube |
A function generator driving a speaker generates standing waves in a long hollow tube; the end can be open or closed and the tube probed by a tiny microphone. |
|
W-d3d |
Bloogle |
Whirl a corrugated plastic tube to produce sound. At least five tones can be heard. |
|
W-d3g |
Ruben's Tube |
Show nodes and antinodes with the flames coming from a row of holes in a hollow tube filled with propane. |
|
W-d3f |
Kundt's Tube |
Sawdust in a tube piles up at standing-wave nodes when driven by rubbing a rod attached to a disc. |
|
Air Column Instruments | |||
W-d3b |
Organ Pipe |
A closed-end, square wood organ pipe of adjustable length. |
|
W-d3e |
Conical Organ Pipes |
A collection of conical pipes. |
|
W-d3c |
Trombone |
A student-class trombone illustrates the effect of pipe length on resonant frequencies. |
|
W-d3h |
Palm Pipes |
This set of PVC tubes can be used by a group to play America, Twinkle twinkle little star, Happy Birthday, and other songs. |
|
Resonance in Plates, Bars, Solids | |||
W-d4d |
Stroked Aluminum Rod |
An aluminum rod sings when stroked with rosin-covered fingers. |
|
W-d4c |
Chladni Plates |
A driven Chladni plate covered with sand shows standing wave patterns. Noisy! |
|
W-d4g |
Musical Goblet |
Rub the edge of a goblet with a wet finger to make it sing. An oscilloscope can be used to measure the frequencies. |
|
W-d4h |
Spouting Bowl |
Generate sprays of water by rubbing the handles of this bronze vessel half-filled with water. |
|
W-d4i |
Styrofoam Cup Standing Waves |
Generate sprays of coffee by sliding a filled styrofoam coffee cup across a table. |
|
W-d4f |
Shattering Wineglass with Sound |
Shatter a wine glass with sound waves at the glass resonant frequency |
|
W-d4j |
Glass Breaker Resonance Box |
Glass plates resonate at low frequencies and will break if slightly scored. |
|
Tuning Fork | |||
W-d4e |
Tuning Fork and Strobe |
The motions of a 100 Hz and 440 Hz tuning fork can be heard and clearly seen with a strobe. |
|
Thermodynamics | |||
Thermal Properties of Matter | |||
Solid Expansion | |||
H-a3a |
Bimetallic Strip |
Strips of dissimilar metals bonded together bend when heated. Makes a nice thermometer. |
|
H-a3b |
Ball and Ring |
The Ball will pass through the hole in the brass plate (termed the ring) when both are at room temperature. When the ball is heated with the torch it expands and will not pass through the ring. |
|
Heat and the First Law | |||
Heat Capacity and Specific Heat | |||
H-b1a |
Calorimeter and Steel Mass |
The heat capacity of a 1 kg steel mass is measured by calorimetry. |
|
H-b1b |
Metals Sinking into Wax |
Hot copper, lead, and aluminum cylinders at a common temperature are placed on a wax block. |
|
Convection | |||
H-b2a |
Convection Tube |
One side of a glass tube loop is heated while a drop of ink is inserted in the other side. |
|
Conduction | |||
H-b3a |
Melting Wax on Rods |
Three metal rods (Cu, Al, Steel), with wax mounted on the ends of each, radiate horizontally from a central heated disk. This is a race to see which melts first. |
|
H-b3b |
Ice Melting Blocks |
A chunks of ice placed on an aluminum block melts much quicker than ice on a foam block. |
|
Radiation | |||
H-b4b |
Light the Match |
A match at the focus of one parabolic mirrir is lit by a heating element at the focus of another parabolic mirror. |
|
H-b4c |
Infrared Camera -- Blackbody Radiation |
An infrared camera is aimed at the class and at various hot and cold heat sources. |
|
H-b4a |
Black and White Radiation |
A thermopile with indicator is held to both sides of a hot coffeepot with one side painted black and the other side white. |
|
Mechanical Equivalent of Heat | |||
H-b6a |
Dropping Lead Shot |
One kg of lead in a 1 m long tube is inverted repeatedly and the temperature rise is measured. |
|
H-b6c |
Happy and Unhappy Balls in Infrared |
An infrared camera shows the temperature rise in the unhappy ball as it is repeatedly hit with a wood block; the effect is much weaker in the happy ball. |
|
H-b6b |
Stretching Rubber Band |
Stretch a rubber band or balloon and feel the heat generated with your lips. |
|
H-b6d |
Friction Tracks |
An infrared camera shows the temperature rise due to the frictional forces acting on the floor as a foot or block is dragged across the floor. |
|
Adiabatic Processes | |||
H-b7a |
Fire Syringe |
A small (2mm x 2mm) piece of tissue is put at the bottom of the "fire torch," a clear glass cylinder that is closed at one end. When a plunger is inserted into the open end and rapidly pressed inwards, the tissue bursts into flames. |
|
H-b7b |
Quickly Plunging Plastic Piston |
A thermocouple embedded in a cylinder-and-piston assembly causes a galvanometer deflection when the cylinder is pressurized. |
|
Change of State | |||
PVT Surfaces | |||
H-c1a |
PVT Surfaces |
Three dimensional models, about 25 cm on a side, of the PVT surfaces for water and carbon dioxide. |
|
Phase Changes: Liquid-Solid | |||
H-c2a |
Ice Bomb in Liquid Nitrogen |
An iron vessel filled with water breaks when immersed in liquid nitrogen. |
|
Phase Changes: Liquid-Gas | |||
H-c3a |
Boiling by Cooling |
Use ice to cool a stoppered flask of hot water until boiling starts. |
|
H-c3e |
Whistling Tea Kettle with LN2 |
Boil liquid nitrogen in a tea kettle. |
|
Cooling by Evaporation | |||
H-c3b |
Cryophorus |
When one end of a glass tube with bulbs at each end containing water is placed in liquid nitrogen, the water at the other end starts to freeze. BROKEN |
|
H-c3c |
Drinking Bird |
This toy bird keeps bobbing its head in water because the evaporative cooling and internal pressure differences force the liquid inside above its center of mass, whereupon it tips, momentarily restoring equilibrium. |
|
Vapor Pressure | |||
H-c3d |
Hand Boiler |
Warmth from your hand forces liquid from the bottom to the top bulb. |
|
Sublimation | |||
H-c4a |
Carbon Dioxide Sublimation |
A balloon filled with gaseous carbon dioxide is immersed in liquid nitrogen, sublimating the carbon dioxide to a solid and reducing the balloon to its original size. |
|
H-c4c |
Dry Ice on Block |
Dry Ice and Water Ice are placed on aluminum blocks; the water ice melts to liquid water while the dry ice disappears (slowly...) |
|
Phase Changes: Solid - Solid | |||
H-c4b |
Memory Wire (Nitinol) |
Heat a bent Nitinol wire with warm water and it springs back to its original shape |
|
Kinetic Theory | |||
Brownian Motion | |||
H-d1a |
Brownian Motion - Smoke Cell |
The Brownian movement of smoke particles in air is projected onto a screen or wall for all to see. |
|
H-d1b |
Brownian Motion Applet |
Browning motion java applet: http://www.phy.ntnu.edu.tw/ntnujava/viewtopic.php?t=41 |
|
H-d1c |
Brownian Motion - Aqueous small spheres |
The Brownian movement of small latex or glass spheres in water is projected onto a screen or wall for all to see. |
|
Mean Free Path | |||
H-d2a |
Crookes' radiometer |
Light shining on the "radiometer" makes the vanes spin, but in a direction opposite to that expected for light absorption and reflection. |
|
Kinetic Motion | |||
H-d3a |
Vertical Molecular Motion Simulator |
A large disk and a set of small BBs are set into motion by a vibrating plate. |
|
H-d3b |
Equipartition of Energy--balls in cup |
As this cup of balls is jostled manually with increasing fervor, first the cork, then the polystyrene, and finally the aluminum ball is knocked out. |
|
H-d3c |
Equipartition of Energy--vibrating frame |
A vibrating frame with two collections of balls differing in mass is used to simulate gases of different molecular weights. |
|
Molecular Dimensions | |||
H-d4a |
Monolayer demonstration -- oil putting out flame |
A drop of oil puts out the flames of a water/ether mixture |
|
H-d4b |
Dust Explosion |
Corn starch dust blown into a flame catches on fire. |
|
H-d4c |
Diet Coke and Mentos |
Drop mentos mints into a bottle of diet coke to produce a geyser |
|
Diffusion and Osmosis | |||
H-d5a |
Ink in Water |
A drop of ink diffuses slowly in water |
|
H-d5b |
Permeable Membrane--sucrose/water |
Sucrose solution rises against atmospheric pressure driven by osmotic pressure. |
|
Gas Law | |||
Constant Pressure | |||
H-e1c |
Charles' Law--Piston Chamber and Flask |
The piston rises and falls depending on whether the flask is heated or cooled. |
|
H-e1a |
Balloons in liquid nitrogen |
Liquid nitrogen is poured over an air-filled balloon until it collapses. |
|
H-e1b |
Helium balloon in liquid nitrogen |
Immerse a He balloon successively in graduated pyrex beakers of water and liquid nitrogen to measure its change in volume with temperature at constant pressure |
|
H-e1d |
Heat Engine--Piston Chamber and Flask |
A mass on top of the piston is lifted when the flask is heated. |
|
Constant Temperature | |||
H-e2a |
Boyle's Law--Piston Chamber and Flask |
Vary the mass on top of the piston and observe the volume change |
|
H-e2b |
Pop Gun |
The pop-gun is an example of adiabatic compression |
|
H-e2c |
Egg yolk separated from white by vacuum |
Separate an egg yolk from an egg white by picking up the yolk with a squeezed plastic bottle. |
|
Constant Volume | |||
H-e3a |
Gay-Lussac's Law--Constant Volume bulb |
The constant volume bulb is filled with helium at room temperature and pressure, then sealed. It is then immersed in boiling water, ice water, and liquid nitrogen (or in a alcohol/acetone bath). |
|
Constant NUmber | |||
H-e4a |
Egg in Milk Bottle |
A peeled, hardboiled egg is sucked into a milk bottle when the bottle is cooled, and comes out when the bottle is heated. |
|
Entropy and the Second Law | |||
Heat Cycles | |||
H-f3b |
Carnot Cycle Simulation |
Carnot Cycle Java Applet: http://www.phy.ntnu.edu.tw/ntnujava/viewtopic.php?t=40 |
|
H-f3a |
Stirling Engine |
An excellent, simple, working model of the Stirling engine. |
|
H-f3d |
Stirling Engine on Top of Cup |
A Stirling engine on top of a cup of hot water drives a flywheel. |
|
H-f3c |
Solid State Heat Engine - Nitinol |
A heat engine based on the 60C phase transition of a nitinol wire loop. |
|
Electricity and Magnetism | |||
Electrostatics | |||
Producing Static Charge | |||
EM-a1a |
Frictional Electricity |
An electroscope is charged using charged rods. |
|
EM-a2c |
Party balloon on wall |
Rub a balloon against your hair or wool shirt and stick it on the wall. |
|
EM-a2e |
Paper pickup with charged objects |
Use a comb, PVC rod, glass rod, or other charged object to pick up pieces of paper |
|
EM-a1b |
Electrophorus |
The top plate of an electrophorus is charged by induction. |
|
Coulomb's Law | |||
EM-a2a |
Charged Rods on Pivots |
A charged rod on a pivot is used to show attraction and repulsion by another charged object. |
|
EM-a2d |
Large Sphere and Ping Pong Ball |
A small charged ball is repelled from a large charged sphere. Attraction and induction can also be shown. |
|
EM-a2f |
Cavendish's Electrostatic Experiment |
The inner of two concentric spheres connected via a thin wire remains uncharged when the other sphere is charged. |
|
Electrostatic Meters | |||
EM-a2b |
Conductive Balls |
Two lightweight conducting spheres suspended by nylon thread can be used as charge indicators |
|
Conductors and Insulators | |||
EM-a3a |
Conductors and Insulators |
Shows that charge can be transferred to an electroscope through conductors but not insulators |
|
Induced Charge | |||
EM-a4a |
Electroscope Charged by Induction |
Charge an electroscope by induction. |
|
EM-a4d |
Inducing Charge -- Two Balls |
Two conducting balls in contact are separated in the presence of a nearby charged rod. |
|
EM-a4b |
Charged Rods and Aluminum Can |
A charged rod can be used to pull a soda can by electrostatic induction |
|
EM-a4c |
Deflection of stream of water |
A charged rod deflects a stream of water. |
|
EM-a4e |
Kelvin Water Dropper |
A high potential and sparks are produced by falling water droplets. |
|
Electrostatic Machines | |||
EM-a5a |
Wimshurst Machine |
Generate sparks with a Wimshurst Machine, and explain its workings. |
|
Electric Fields and Potential | |||
EM-a5b |
Van de Graaff Generator |
Describe the operation of the Van de Graaff and show sparks from the ball to a nearby grounded conductor. |
|
EM-a5c |
Van de Graaff Generator--Sound |
The engine strains more and more as the charge on the dome increases. |
|
Electric Fields | |||
EM-b1b |
Hair on End |
Charge yourself with a Van de Graaff generator |
|
EM-b1m |
Van de Graaff stick |
Aluminum floaters are held aloft with the Fun Fly Stick |
|
EM-b1c |
Styrofoam Peanut Blowout |
Styrofoam peanuts in a box on top of the Van de Graaff fly out. |
|
EM-b1e |
Tart Pan Blowoff |
Tart pans stacked on top of the Van de Graaff fly off. |
|
EM-b1f |
Ball Charge Transfer |
A conductive ball bounces between electrically charged vertical plates |
|
EM-b1i |
Franklin's Bells |
A conductive ball bounces between electrically charged bells |
|
EM-b1j |
Ball between horizontal charged plates |
A conductive ball bounces between horizontal charged vertical plates |
|
Electric Field | |||
EM-b1d |
Electric Field Visualizer |
Tiny fibers in a clear oil align in the direction of strong applied electric fields. |
|
EM-b1k |
Visualizing Field Lines in a Capacitor |
Use the Electric Field Visualizer with two parallel conductors to show the field lines for a capacitor including edge effects |
|
EM-b1g |
Torque on Electric Dipole |
A small rod aligns between parallel plates |
|
Gauss' Law | |||
EM-b2a |
Faraday Bucket |
Show that charge resides on the outside of a hollow conductor. |
|
EM-b2f |
Gauss with Electric Field Visualizer |
Tiny fibers in a clear oil that align in the direction of strong applied electric fields remain randomly oriented inside a charged ring. |
|
EM-b2b |
Radio in a Cage |
Surround a radio by a Faraday cage and the signal goes away |
|
Electrostatic Potential | |||
EM-b3b |
Electric Potential -- Parallel Plates |
Show that the electric potential varies linearly with distance between Parallel Plates |
|
EM-b3h |
Electric Potential -- Point Charge |
Show the electric potential variation with distance for a small disk of charge approximating a point charge. |
|
EM-b3a |
Surface charge density - conducting balls |
A pair of large balls with the same separation as a pair of small balls are charged simultaneously with the Wimhurst. |
|
EM-b3i |
Charged ovoid breakdown |
A charged ovoid with grounded spheres at each end breaks down at its sharper end. |
|
EM-b3c |
Charged Ovoid |
Use a proof plane and an electroscope to compare charge densities at different points on an egg-shaped conductor. |
|
EM-b3g |
Lightning Rod |
Electrical arcing between two large metal spheres abruptly ceases when the lightning rod is touched to one. |
|
EM-b3d |
Electric Wind -- Wimshurst |
A point attached to a Wimshurst electrode blows a candle flame. |
|
EM-b3f |
Electric Wind with Van de Graaff |
A point attached to the Van de Graaff blows a hanging piece of cardboard. |
|
EM-b3e |
Van de Graaff Pinwheel |
A pinwheel rotates on top of a van de Graaff generator. |
|
Force on Moving Charge | |||
EM-b4a |
Electron Beam Between Parallel Charged Plates |
An electron beam is deflected by the nominally uniform electric field between parallel, oppositely charged plates.(viewing beam from side) |
|
Electric Fields | |||
EM-b4b |
Oscilloscope |
Show that an electron beam passing between charged, parallel plates is deflected using an oscilloscope (view along beam) |
|
Capacitance | |||
Capacitor | |||
EM-c1a |
Parallel Plate Capacitor and Electroscope |
Vary the spacing of a parallel plate capacitor attached to an electroscope. |
|
EM-c1b |
Rotary Plate Capacitor and Electroscope |
The rotary plate capacitor is attached to the electroscope. |
|
Dielectric | |||
EM-c2a |
Parallel Plate Capacitor with Dielectric |
Insert and remove a dielectric sheet from a charged parallel plate capacitor attached to an electroscope. |
|
EM-c2c |
Force on a dielectric |
Mineral oil climbs in the gap between parallel plates |
|
EM-c2b |
Dissectable Capacitor |
This curious capacitor is charged, disassembled, passed around, assembled, and discharged with a spark. |
|
Energy Stored in a Capacitor | |||
EM-c3a |
Explosive Capacitor Discharge |
Discharge a 10kV, 1uF capacitor through a thin wire or thick screwdriver |
|
EM-c3b |
Bulb and 1 Farad Capacitor |
A large (1 Farad) capacitor is charged with a battery then discharged through a light bulb. |
|
EM-c3c |
Bulb and 1 Farad Capacitor with DVM |
A large (1 Farad) capacitor is charged with a battery then discharged through a light bulb, with output monitored with DVM |
|
EM-c3d |
Bulb and 1 Farad Capacitor with Oscilloscope |
A large (1 Farad) capacitor is charged with a battery then discharged through a light bulb, with output monitored with an oscilloscope. |
|
Resistance | |||
Resistance Characteristics | |||
EM-d1c |
Resistor Assortment |
Show an assortment of resistors, of different type and values. |
|
EM-d1a |
Wire Resistivity |
Place 6V across a set of wires of different diameters and measure the currents. |
|
EM-d1b |
Corregated Tube and Ping Pong Balls |
Ping pong balls tumble down a corregated tube. |
|
Resistivity and Temperature | |||
EM-d2a |
Change of Resistance with Temperature |
A coil in series with a lamp is immersed in liquid nitrogen making the lamp glow brighter. |
|
EM-d2b |
Carbon Resistor in Liquid Nitrogen |
Drop a resistor in liquid nitrogen and measure its resistance. |
|
EM-d2c |
Conduction in Glass |
Heat a glass rod with a flame until its resistance is low enough to sustain conduction. |
|
Conduction in Gases | |||
EM-d4a |
Jacob's Ladder |
An arc rises between rabbit ear electrodes attached to a high voltage source. |
|
Electromotive Force and Current | |||
Cells and Batteries | |||
EM-e4a |
Lemon Battery |
Stick copper and zinc electrodes into a lemon and measure the potential difference with a voltmeter |
|
EM-e4b |
Internal Resistance of Battery |
Measure the voltage across a battery as its load decreases |
|
Thermoelectricity | |||
EM-e1a |
Thermocouple |
Show a thermocouple in operation |
|
Piezoelectricity | |||
EM-e6a |
Piezoelectric Demonstrator |
Generate sparks by compressing a piezoelectric crystal. |
|
Other Sources of EMF | |||
EM-e7a |
Van de Graaff as emf Generator |
Use the grounding wand and a single streamer to show the Van de Graaff generating a constant emf |
|
DC Circuits | |||
Ohm's Law | |||
EM-f1a |
Resistor I-V characteristics |
Measure and graph the I-V characteristics for a resistor. The value of the resistance may be varied. |
|
EM-f1b |
Resistance of a Wire |
Measure the potential drop along a wire. |
|
Power and Energy | |||
EM-f1e |
Hot Dog Cooker |
Spike a hot dog with two nails and cook it. |
|
Circuit Analysis | |||
EM-f2a |
Series Circuit with Bulbs |
Show a series circuit of light bulbs |
|
EM-f2b |
Parallel Circuit with Bulbs |
Show a parallel circuit of light bulbs |
|
EM-f2c |
Series Parallel Combination |
Two bulbs in series with a power supply, and a third bulb in parallel with one of others. |
|
EM-f2d |
Effect of resistive wires on circuit: House of Petar |
Show effect of resistive wire (here a long extension cord) on a household circuit drawing a heavy load; bulb dim when the hairdryer heat is turned on. |
|
RC Circuits | |||
EM-f3b |
Lighting bulb with Capacitor |
A large (1 Farad) capacitor is charged with a battery then discharged through a light bulb. |
|
EM-f3a |
Bulb, 1 Farad Capacitor, and DVM |
Monitor the discharge of a 1 Farad capacitor through a light bulb with a digital voltmeter. |
|
EM-f3c |
RC Time Constant on Scope--Square Wave |
Observe the RC decay from a variable gap capacitor and resistor using a square wave input and oscilloscope. |
|
EM-f3d |
Charging/Discharging of Capacitor with Bulb and Scope |
Oscilloscope display of a 1 Farad capacitor discharging through a light bulb. |
|
EM-f3f |
Battery Charging Capacitor with Bulb Indicator |
Examine the behavior of a light bulb in series with a battery charging up a capacitor. |
|
EM-f3g |
Battery Charging Capacitor Bulb Indicator, var. II |
Examine the behavior of a light bulb in series with a battery charging up a capacitor. |
|
EM-f3e |
Capacitors in Series and Parallel |
Discharge a 0.1F capacitor through a light bulb, and compare with that for three in series and three in parallel |
|
Magnetic Materials | |||
Magnets | |||
EM-g1c |
Buzz Magnets |
A pair of hematite magnets; throw them up separately and they'll combine with a buzz. |
|
EM-g1a |
Lodestone |
Show that the lodestone attracts small nails and paperclips. |
|
EM-g1b |
Steel Bar and Magnet Puzzle |
Given only a cylindrical magnet and a similarly shaped steel bar, figure out which is which! |
|
EM-g1d |
Gauss Rifle Linear Accelerator |
A chain of magnets in gauss-rifle arrangements accelerates a steel ball |
|
Magnet Domains and Magnetization | |||
EM-g2c |
The Barkhausen Effect |
Clicking noises are heard when a magnet is brought near iron wire within a pickup coil. |
|
EM-g2d |
Magnetic Domains in Ferrimagnetic Garnet |
Watch a ferri-optical garnet between crossed Polaroids on a microscope as a magnet is brought near. |
|
EM-g2a |
Magnetic Domain Model |
An array of small compasses shows domain structures |
|
EM-g2b |
Hard vs. Soft magnetic materials |
A circular magnetic yoke connecting two wire coils is closed with soft and hard materials |
|
Magnetic Domains and Magnetization | |||
EM-g2e |
Ferrofluid Display Cell |
||
EM-g2f |
Magnetic Permeability - Jumping Ring Height |
The height to which the jumping rings jumps depends on how far the yoke extends |
|
Paramagnetism and Diamagnetism | |||
EM-g3b |
Paramagnetic Aluminum |
A small aluminum rod suspended by a thread in the gap of a powerful magnet aligns with the field. |
|
EM-g3c |
Diamagnetic Glass |
A small glass rod suspended by a thread in the gap of a powerful magnet orients transverse to the magnetic field. |
|
EM-g3e |
Floating Diamagnetic Graphite |
A piece of diamagnetic graphite floating on water is pushed around by a magnet. |
|
EM-g3a |
Paramagnetic Liquid Oxygen |
Liquid oxygen condensing from air drips into the gap of a strong magnet |
|
EM-g3d |
Diamagnetic Levitator |
A small magnet is suspended in mid-air between two diamagnetic graphite disks. |
|
Temperature and Magnetism | |||
EM-g5c |
Curie Point Heat Engine |
A small loop of nickel-alloy wire attracted to a magnet keeps oscillating as it heats and cools through its Curie point. |
|
EM-g5a |
Meissner Effect |
Cool a superconductor and it will levitate and float a magnet. |
|
EM-g5b |
Hopkins Superconducting Model Maglev Train |
A model train with with two superconducting disks cooled by LN2 glides over a track of powerful magnets |
|
Magnetic Fields and Forces | |||
Magnetic Fields | |||
EM-h1c |
Dip Needle |
A dip needle is used to show the inclination of the earth's field. |
|
EM-h1a |
Oersted Experiment on Overhead |
Show that current in a wire deflects a compass needle. |
|
EM-h1i |
Oersted Experiment - Large Compass |
Show that current in a wire deflects a compass needle. |
|
EM-h1d |
Magnet and Compass Array -- 2D |
A small magnet on top of the magnetic domain model apparatus |
|
EM-h1j |
Magnet and Iron Filings Panel - 2D visualization |
Iron filings in a viscous liquid sandwiched between plastic sheets show the path of magnetic field lines. Suitable to pass around |
|
EM-h1q |
B Field of Large Bar and Horseshoe Magnets |
||
EM-h1e |
Magnet and Iron Filings -- 3D |
A bar magnet surrounded in 3D by a clear acrylic tank filled with a liquid containing iron filings. |
|
EM-h1g |
Gap and Field Strength--Electromagnet |
Use a Teslameter to measure the field strength in the gap of an electromagnet, varying the spacing and pole piece diameter. |
|
EM-h1p |
Measuring Magnetic Fields with Sensor |
Use a Vernier magnetic field sensor to measure the field about a wire, a solenoid, or magnet. |
|
EM-h1f |
Magnetic Screening |
Insert Acrylic, Aluminum, Copper, and Steel sheets between a magnet and a collection of nails |
|
EM-h1h |
Magnetostatic Gauss' Rifle |
A ball rolling in a groove bumps into an array of magnet-ball-ball, firing off the last ball of the sequence. Single shot (4 balls) and multiple-stage, magnetostatic accelerator versions available. |
|
99999 |
MainSpring Test | Nov 2020 |
||
Fields and Currents | |||
EM-h1k |
B-Field due to long straight wire |
Iron filings are sprinkled on a plexiglas plate through which a long vertical current-carrying wire passes. |
|
EM-h1m |
B-Field due to single coil. |
Iron filings are sprinkled on a plexiglas plate through which a single loop of current-carrying wire is mounted |
|
EM-h1n |
B-Field due to solenoid |
Iron filings are sprinkled on a plexiglas plate through which a current-carrying solenoid is mounted. |
|
Forces and Currents | |||
EM-h1r |
Measuring B-Field due to Current-Carrying Wire |
Use a magnetic field sensor to measure the magnetic field from a current carrying wire or solenoid |
|
Forces on Magnets | |||
EM-h2c |
magnetic dipole in external magnetic field |
Shows that a magnet is rotated but not displaced by a uniform B field, and displaced, but not rotated, by a grad B field where B itself is zero. |
|
EM-h2f |
Torque balance with air bearing magnet |
Balance the magnetic torque on a dipole with a gravitational torque. |
|
EM-h2d |
Precessing Magnetic Dipole |
A magnetic dipole floating in an air bearing precesses in a uniform B field. |
|
EM-h2e |
Classical Magnetic Resonance |
Rotate a transverse magnetic field to "flip" the spin of a precessing magnetic dipole. |
|
EM-h2a |
Magnets on Pivots |
One magnet is placed on a pivot. The other is used to attract or repel the first |
|
EM-h2b |
Ring Magnets on a Pole |
Two or more ring magnets are placed on a vertical pole |
|
EM-h2g |
Robby the Seal |
A puzzle--how does the seal balance the ball and make the ball rotate when brought near to it? |
|
EM-h2h |
Magnetic Ballerina Puzzle |
The ballerina twirls when put in front of the mirror; hidden magnets exert the force. |
|
Force on Moving Charges | |||
EM-h3a |
e/m tube |
Deflect the beam in an e/m tube with magnets |
|
EM-h3b |
Oscilloscope and magnet |
Deflect the beam in an oscilloscope with magnets |
|
Force on Current in Wires | |||
EM-h4a |
Force Between Two Current Carrying Conductors |
Show on the overhead projector that long parallel wires with currents in the same (opposite) directions attract (repel). |
|
EM-h4c |
AC and DC Lamps |
A magnet is brought near two carbon filament bulbs, one DC powered and one AC powered. |
|
EM-h4b |
Force on Current-carrying wire |
A loop of wire swings to the side of a U-magnet's gap when connected to a current-limited power supply. |
|
EM-h4e |
Jumping Wire |
A length of wire jumps out of the gap of a U-magnet when connected to a current-limited power supply or battery. |
|
EM-h4d |
Rail Gun -- External Magnet |
A wheel and axle accelerate along two electrified rails over strong rare-earth magnets |
|
Torques on Coils | |||
EM-h5a |
Galvanometer |
A magnet exerts a torque on a current-carrying coil. |
|
EM-h5b |
Force on a current loop |
Use a coil centered in a magnetic field to show what happens when current is applied. |
|
Inductance | |||
Self-Inductance | |||
EM-j1b |
Back EMF with light bulb |
A light bulb in parallel with an inductor flashes when its power is disconnected. |
|
EM-j1a |
Inductance Spark--Large Electromagnet |
A bright spark is produced when the switch of a large electromagnet is opened |
|
EM-j1c |
Inductance Spark -- classroom version |
A bright spark is produced when an inductor is disconnected from a power supply |
|
LR Circuits | |||
EM-j2a |
Series RL circuit: L/R charge/discharge |
"Charging" and "Discharging" of inductor shown with square wave and oscilloscope |
|
EM-j2b |
Series RL circuit: L/R phase shifts |
Show phase shifts in a series RL circuit using the oscilloscope. |
|
EM-j2d |
LR circuit charging and discharging - DC version |
"Charging" and "Discharging" of inductor with a DC power source, switch, and oscilloscope |
|
EM-j2c |
Variable Inductor |
A lamp in series or parallel with a variable inductor. |
|
RLC Circuits - DC | |||
EM-J3a |
non-driven LRC circuit oscillations |
Show the oscillations (ringing) when a charged capacitor is connected in series to an inductor and small resistor. |
|
EM-J3b |
non-driven RLC ringing with audio |
A battery "charges" a capacitor and inductor in parallel; when disconnected, the resulting induced ringing current is shown on an oscilloscope and heard through a speaker. |
|
Electromagnetic Induction | |||
Induced Currents and Forces | |||
EM-k1g |
Sliding bar in magnetic field |
A bar sliding on rails over a bed of magnets generates an emf along the bar. |
|
EM-k1a |
Induction Coil and Magnet |
A magnet is moved in and out of a coil connected to a galvanometer |
|
EM-k1c |
Loop rotating in magnetic field |
A loop of wire is rotated in in the gap of a permanent magnet. |
|
EM-k1d |
Pickup Coil and Magnet |
A magnet is moved in and out of a coil connected to a galvanometer |
|
EM-k1h |
Props for Story of Universality of Faraday's Law |
Props to illustrate the story of the Universality of Faraday's Law. |
|
EM-k1e |
Audible Pickup Coil |
Generates sounds in a pickup coil connected to a speaker with a steel tuning fork. |
|
EM-k1b |
Induction with Coils and Battery |
Attach one coil to a galvanometer, another to a battery and tap switch. Use a core to increase coupling |
|
EM-k1f |
Current Coupled Oscillators |
A magnet suspended by a spring inside a wire coil induces oscillations in a second magnet that is spring-suspended over a second coil. |
|
Eddy Currents | |||
EM-k2a |
Eddy Current Pendulum - Lecture Hall |
A copper sheet, a comb, a ring, and a broken ring are swung through a large electromagnet. |
|
EM-k2f |
Eddy Current Pendulum -- Classroom |
Swing solid. open-slotted, and closed-slotted paddles between the poles of a neodymium magnet. |
|
EM-k2b |
Magnets and Long Eddy Tubes |
Drop magnet and a non-magnetic dummy down an aluminum tube. |
|
EM-k2c |
Magnet and Copper Tube |
Drop magnet down a short length of straight copper tubing and watch it fall. |
|
EM-k2h |
Pushing and Pulling Ring with Magnet |
Push and pull a solid aluminum ring suspended from strings; a split ring is provided for comparison. |
|
EM-k2i |
Magnet Pushing and Pulling Ring - Small Version |
Push and pull a solid aluminum ring suspended from strings; a split ring is provided for comparison. |
|
EM-k2d |
Jumping Rings |
A solid conducting ring sitting on a vertical solenoid jumps and a split ring doesn't |
|
EM-k2e |
Eddy current levitator |
A strong ceramic magnet is levitated over a spinning aluminum disc. |
|
EM-k2j |
Metal Egg on Magnetic Stirrer |
An ovoid stands up on a magnetic stirrer, à la Tesla's Egg of Colombus |
|
EM-k2k |
Electromagnetic Can Crusher |
A capacitor discharged into a coil of few turns creates a strong magnetic field that pinches and crushes a soda can. |
|
Transformers | |||
EM-k3b |
Dissectable Transformer |
Light a bulb and show voltage relationships with various coil and frequency combinations. |
|
EM-k3a |
Transformer |
Demonstrate step-up and step-down transformers. |
|
EM-k3c |
Lines of Current with Clamp-On Ammeter |
Measure and count lines of current with a commercial clamp-on ammeter. |
|
Motors and Generators | |||
EM-k4e |
Handheld DC Motor |
Run the handheld DC generator with a 1.5 or 3 V battery |
|
EM-k4a |
AC Generator/Motor |
Rotating a wire loop in a magnetic field by hand generates an AC current; it can be driven by connecting it to a function generator. |
|
EM-k4b |
DC Generator |
Generate a DC current by rotating a loop with a split-ring connection in a magnetic field. |
|
EM-k4c |
Direct Current Motor |
Show and explain a DC motor running on batteries. |
|
EM-k4h |
Induction Motor - Disassembled Fan |
An aluminum ball rotates in the center of a coil-created rotating magnetic field. |
|
EM-k4g |
World's Simplest Motor |
A simple DC motor that requires only a battery, a bare wire, a nail, and a magnet. |
|
EM-k4d |
Hand-held DC Generator |
Use the handheld generator to illuminate a bulb. |
|
EM-k4f |
Hand-powered flashlight |
The Dynamo--a hand powered flashlight |
|
Eddy Currents | |||
EM-k2g |
Induction Flashlight |
This flashlight runs on induction-induced currents, a capacitor, and an LED lightbulb. |
|
AC Circuits | |||
Models and Props | |||
EM-L1a |
Arrows on rotating board |
Magnetic arrows on metallic, circular rotation board make a prop for phasors. |
|
Impedance | |||
EM-L1b |
Inductive Choke |
An inductor with a moveable iron core is connected in series with a light bulb. |
|
EM-L1c |
Capacitive Reactance |
A capacitor is connected in series with a light bulb and the frequency is varied. |
|
LRC Circuits--AC | |||
EM-L2a |
60 Hz LRC circuit |
Shows the potential difference across the Capacitor and Inductor at resonance. |
|
EM-L2b |
LRC circuit with function generator |
Show the relative phases and amplitudes for the potential differences across the components of an driven LRC circuit. |
|
EM-L2d |
RC Circuit -- Phase relations |
Show the potential difference across the power supply, the resistor, and the capacitor as a function of frequency, resistance, or capacitance. |
|
EM-L2e |
RL Circuit -- Phase relations |
Show the potential difference across the power supply, the resistor, and the inductor as a function of frequency, resistance, or inductance. |
|
EM-L2f |
driven LRC circuit at resonance |
Compare the amplitudes of the power supply voltage to the voltage over the capacitor at resonance. Note the phase shift. |
|
Filters and Rectifiers | |||
EM-L3a |
Bridge Rectifier with LEDs |
Operate a bridge rectifier with LEDs at low frequency |
|
Semiconductors and Tubes | |||
Semiconductors | |||
EM-m1b |
Hall Effect |
Measure the transverse potential difference between between the sides of silver or tungsten in crossed electric and magnetic fields |
|
Diode | |||
EM-m1a |
Diode I-V characteristics |
Circuit for measuring the I-V characteristics of a diode |
|
Electromagnetic Radiation | |||
Displacement Current | |||
EM-n1j |
Displacement Current - Capacitor and Bag |
Use PVC rods, a large capacitor, and a plastic bag to show surface integral conundrum. |
|
EM-n1k |
Displacement Current - Toroidal Probe |
Current is induced in a probing coil between two capacitor plates just as it is near the wires |
|
Transmission Lines and Antennas | |||
EM-n1f |
Model Transmission Line |
A model of a transmission line that can be used to show how a pulse is diminished and delayed as it propagates. |
|
EM-n1g |
Coaxial Cable Samples |
Coaxial cable samples to pass around |
|
EM-n2b |
Slow Propagation along a Transmission Line (Nerve Conduction Model) |
Resistive bulbs in an RC transmission line light up in succession. |
|
EM-n1d |
Propagation Velocity in Coaxial Cable |
To show and measure the finite velocity of an electromagnetic pulse in a length of coaxial cable. |
|
EM-n1e |
Reflections in Coaxial Cable |
Show the reflected pulse in a 50 ohm coaxial cable terminated with an infinite, 50 ohm, and zero ohm impedance. |
|
EM-n1c |
Microwave Standing Waves |
Use a microwave generator, detector, and metal sheet to show standing waves |
|
EM-n1h |
Microwave Waveguide - Sample |
A sample of microwave waveguide and tubing |
|
EM-n1i |
Microwave Waveguide |
Roll a steel tube in front of a microwave generator and measure the intensity at the end. |
|
EM-n1a |
Radiation from a Dipole |
Use a transistor radio to pick up a 100 MHz signal generated by a function generator. |
|
EM-n1m |
AM Radio |
Modulate the output of a function generator attached to an antenna and detect the output with a transistor radio |
|
EM-n1b |
Microwave Generation and Detection |
Show the generation and detection of microwaves including polarization |
|
EM-n1n |
Radio Waves from Sparks |
Use a radio to pick up wide-range radiation from sparks, electrostatic friction, and the like. |
|
Tesla Coil | |||
EM-n2a |
Tesla Coil |
Light a fluorescent lamp by holding it near a Tesla Coil |
|
EM-n2c |
Large Tesla Coil |
Light a fluorescent lamp by holding it near a Tesla Coil |
|
EM-n2d |
Plasma Mug |
Light up gas inside the mug walls by placing it near a Tesla Coil |
|
EM-n2e |
Plasma Ball |
Show and Touch the Plasma Ball and draw sparks toward your finger. |
|
EM-n2f |
Plasma Disk |
Believed to be a plasma screen version of the Plasma Ball |
|
Electromagnetic Spectrum | |||
EM-n3b |
Project the Spectrum |
Project white light through a high-dispersion prism |
|
EM-n3c |
USA Radio Frequency Allocation Chart |
Radio Frequency Allocation Chart found at http://www.ntia.doc.gov/osmhome/allochrt.pdf |
|
EM-n3a |
Microwave Transmission |
Insert different materials (wood, metal, plastic, metal grill of small holes, wet and dry cloths) in a microwave beam |
|
Optics | |||
Geometrical Optics | |||
Speed of Light | |||
O-a1b |
Speed of light in fiber optic cable |
Compare the time for a light pulse to travel through two different lengths of fiber optic cable. |
|
O-a1i |
Speed of Light -- Rotating Mirror Method |
Measure the speed of light by Foucault's rotating mirror method |
|
Straight-Line Propagation | |||
O-a1a |
Light Bulb in Vacuum |
Show a buzzer and light bulb in vacuum |
|
Reflection from Flat Surfaces | |||
O-a1c |
Blackboard Optics -- Plane Mirror |
Use multiple-beam generator to show image formation with a plane mirror. |
|
O-a1g |
Diffuse vs Specular Reflection |
Reflect light first from a shiny surface, then from a rough surface. |
|
O-a1j |
Diffuse vs Mirror Reflection -- Quantitative |
Reflect light off of an acrylic surface into a photometer; repeat with a mirror |
|
O-a1h |
Glancing and Normal Reflection |
Observe image formation at glancing angles from glass and metal surfaces |
|
O-a1d |
Corner Reflector |
Look into a corner reflector |
|
O-a1f |
3-D axes in Plane Mirror |
Right-handed and left-handed coordinate axes illustrate parity reversal in a mirror. |
|
O-a1e |
Multiple Virtual Images |
By folding two mirrors hinged together, show multiple virtual images of a candle. |
|
Reflection from Curved Surfaces | |||
O-a2c |
Blackboard optics -- curved mirrors |
Show image formation (size, location, orientation) from concave and convex mirrors on the blackboard. |
|
O-a2d |
Optic Mirage |
Two concave mirrors face each other. The top mirror has a hole allowing light to enter and escape. An image of the objects resting on the bottom of one appears at the center hole of the top mirror. |
|
O-a2e |
Large Concave/Convex Mirrors |
Shake hands with yourself using the large concave mirror; view images in the large convex mirror. |
|
O-a2f |
Large Concave/Convex Mirrors -- on Stand |
Alternative pair of concave/convex mirrors |
|
Refractive Index | |||
O-a4a |
Magic Mending Solution |
A broken pyrex beaker is "magically" mended with a beaker of Wesson Oil. |
|
O-a4b |
Schlieren Images of Gases |
Blow hot air, light a bic lighter, and/or pour SF6 or CO2 in front of a concave mirror |
|
Refraction at Flat Surfaces | |||
O-a4d |
Refraction with Blackboard Optics |
A single beam of light shines on a large acrylic surface. |
|
O-a4j |
Stick in Water |
A stick appears bent when inserted into the water at an angle. |
|
Total Internal Reflection | |||
O-a4s |
Total Internal Reflection (Blackboard Optics) |
Show total internal reflection with the blackboard optics kit. |
|
O-a4p |
Total Internal Reflection-Fiber Optics |
Shows the path of a laser beam inside an acrylic rod. |
|
O-a4q |
Optical Fibers |
Show (with a laser pointer) and tell with optical fibers |
|
O-a4r |
Fiber Optic Image Conduit |
An image is spatially displaced with an image conduit. |
|
O-a4t |
Light Waterfall -Tyndall's experiment |
Shine a laser beam through a tank of water and out through a hole through the side. |
|
Rainbow | |||
O-a4u |
Rainbow Model |
A flashlight and glass sphere, metallized on back, is used to create a rainbow. |
|
Thin Lens | |||
O-a6a |
Blackboard Optics -- Thin Lens |
Ray trace images using convex and concave lens and a parallel ray box. |
|
O-a6d |
Ripple Tank Lens Model |
Refraction due to water depth differences over a lens-shaped area |
|
O-a6b |
Image formation with Thin Lens |
Project or view the image of an illuminated arrow through a thin lens. |
|
O-a6c |
Magnifying Glass with Eye Model |
Use the Working Eye Model to show a magnifying glass enlarging an object's image and allowing the near point to move closer to the eye. Greater magnifications can be achieved with stronger magnifiers. |
|
Thick Lens | |||
O-a6p |
Chromatic Aberration |
Show chromatic aberration using a large lens and an iris diaphragm. |
|
O-a6q |
Pincushion/Barrel Distortion |
Show pincushion and barrel distortion with a thick lens and grid object. |
|
O-a6r |
Astigmatism |
Rotate a lens that is imaging a point light source to show astigmatism |
|
O-a6s |
Coma |
Rotate a lens that is imaging a point light source to show coma |
|
O-a6u |
Spherical water lens |
Project an image with a water-filled spherical flask |
|
O-a6v |
Dioxide Glass Puzzle |
||
O-a6t |
Fresnel lens |
Look through a Fresnel lens |
|
Optical Instruments | |||
O-a7e |
Two-Lens Microscope Model |
Use two lens to make a simple compound microscope. |
|
O-a7f |
Phase Contrast Microscopy |
Show cheek cells (epithelial) in bright field and phase contrast views. |
|
O-a7g |
DIC (Differential Interference Contrast) Microscopy |
View cells and diatoms with a microscope adjusted for differential interference contrast. |
|
O-a7a |
Microscope Model (Blackboard Optics) |
Mimic a microscope objective with blackboard optics. |
|
O-a7b |
Telescope Model |
Use two lens to make a simple telescope. |
|
O-a7d |
Celestron Telescope |
Show and tell the Celestron C90 telescope with Maksutov-Cassegrain optics, 90 mm aperature, 1 m focal length, and f/11 focal ratio. |
|
Photometry | |||
Blackbodies | |||
O-b4b |
Blackbody Radiation - Infrared Camera |
Examine objects in a dark room with an infrared camera |
|
O-b4a |
Blackbody Radiation - Shift in visible spectrum |
Project the spectrum of an incandescent bulb as a function of temperature. |
|
O-b4c |
Blackbody Radiation - Variac, Lamp, and Spectrometer |
The intensity spectrum of a light bulb is observed to grow more intense and shift to smaller wavelengths as the temperature of the bulb increases. |
|
Diffraction | |||
Diffraction Through One Slit | |||
O-c1a |
Single Slit Diffraction Pattern - Cornell Slits |
Shine a laser beam through single slits of various widths. The Cornell slitfilm is shown; we also have a slitfilm from Pasco |
|
O-c1b |
Microwave Diffraction - Single Slit |
The diffraction pattern of a single slit can be heard with the audio-coupled detector |
|
Diffraction Around Objects | |||
O-c2a |
Arago's (or Poisson's) Spot |
The diffraction pattern from a laser beam shining on a small ball has a bright dot in the center of the shadow of the ball. |
|
O-c2e |
Pin hole diffraction - projected |
View the diffraction pattern of a pinhole; a variety of pinhole dimensions are available. The photo shows 100 um and 50 um round pinhole patterns and 100 um and 50 um square patterns. |
|
O-c2c |
Pin hole diffraction - pass around version |
Look through a pinhole at a bright point light source to see Airy rings. |
|
O-c2d |
Rayleigh Resolution Limit (pass around) |
Look through a succession of pinholes of increasing aperture size at a pair of bright point light sources. |
|
O-c2b |
Fresnel zone plate |
Shine an expanded laser beam at a Fresnel Zone plate and look at the diffraction pattern |
|
Interference | |||
Interference from Two Sources | |||
O-d1a |
Double Slit and Laser - Cornell Slitfilm |
Use a laser bean on the slits on the far column of the Cornell slitfilm to show the effect of increasing the spacing between a pair of slits, with the slit spacing held constant. The first entry is a single slit. |
|
O-d1d |
Double Slit and Laser - Pasco 2-slit slide |
Any pair of the four sharply defined double slit patterns on the Pasco slide produces a nice and extended double-slit pattern when illuminated by a laser beam. |
|
O-d1b |
Microwave Double Slit Interference |
Placing the Aluminum Sheet with Double Slit in front of the Microwave Generator produces a double slit interference pattern which can be detected by the Microwave detector and heard through the auditorium. |
|
O-d1c |
Coherence Length -- Slitfilm |
A Cornell slitfilm and microscope slide are used to show that the coherence length of white light is short compared to laser light. |
|
Interference of Polarized Light | |||
O-d1e |
Interference of Polarized Light |
Show the interference pattern from polarized light of the same, then perpendicular polarizations, then followed by a 45° polarizer. |
|
Gratings | |||
O-d2b |
Rowland Ruling Engine |
The Rowland Ruling Engine, on the second floor of the Bloomberg Center. |
|
O-d2a |
Number of Slits |
Shine a laser beam through various numbers of slits with the same spacing and width |
|
O-d2c |
Types of Diffraction Gratings |
Transmission and Reflection, Blazed and Not, Diffraction Gratings of different line densities probed by a laser. |
|
O-d2g |
Grating, Laser, and Mist |
Use mist to illuminate the beam of a red and then green laser, and then insert a diffraction grating into the beam. |
|
O-d2h |
Diffraction from CDs and DVDs |
Light is diffracted from a CD and DVD |
|
O-d2e |
2D Diffraction - Pasco Patterns |
Show diffraction patterns from two 2D patterns, one square in symmetry and one hexagonal. |
|
O-d2l |
Diffraction from Rabbit Muscle |
A setup for examining the diffraction from the striations in rabbit muscle. |
|
O-d2k |
Diffraction from Butterfly Eye |
A setup for examining the diffraction from a butterfly's eye. |
|
O-d2i |
Holiday Lights and Bulbs |
Look at a string of small light bulbs with double-axis grating glasses |
|
O-d2j |
1D Lattice with Basis - optical crystal |
Diffract laser light from a grating with secondary ("basis") gratings shifted by 0, 1/4, 1/2, and 3/8 of a period of the fundamental 0.30mm "lattice spacing." |
|
O-d2d |
2D Diffraction - Optical Transform Kit |
Diffract laser light with this set of 32 patterns, mostly of 2-D lattices with various symmetries and lattice bases, available from http://ice.chem.wisc.edu |
|
O-d2f |
2D Diffraction - DNA Optical Transform |
Use this set of 12 grating patterns with a laser to teach the diffraction of DNA (slide also available from http://ice.chem.wisc.edu) |
|
Thin Films | |||
O-d3a |
Newton's Rings |
Reflect white light off Newton's Rings onto a screen. |
|
O-d3b |
Soap Film -- 2 Litre Bottle |
View the interference fringes of a soap film in a 2-litre bottle. |
|
O-d3c |
Bubbles |
View large soap bubbles under white light illumination. |
|
O-d3d |
Air Wedge |
Two microscope slides on top of one another produce interference fringes between them. |
|
Interferometers | |||
O-d4a |
Michelson Interferometer |
Show the Michelson Interferometer and how it works. |
|
O-d4b |
Michelson Interferometer and soldering iron |
Produce an interferogram of turbulant air with a soldering iron in the optical path of the Michaelson interferometer. |
|
O-d4c |
Michelson Interferometer -- real vs. virtual fringes |
Compare the virtual interference fringes formed from a planar light source with real fringes from a point light source |
|
O-d4d |
Michelson Interferometer -- Fizeau fringes |
Inclining the mirrors of the interferometer with respect to each other produces straight fringes |
|
Color | |||
Synthesis and Analysis of Color | |||
O-f1d |
Color Mixing with Projectors |
Projectors with red, green, and blue filters show the addition of colors directly and with shadows. Magenta, Yellow, and Cyan filters are also available. |
|
O-f1a |
Spinning Color Sticks |
Red, green, and blue lightsticks in a fan arrangement produce white when spun. |
|
O-f1b |
Glow Ball |
Spinning the Glow Ball produces red, blue and green streaks whereas it appears whitish when not spun. |
|
O-f1c |
RGB Yellow versus Spectral Yellow |
Adjust the monitor's R, G, and B values until the monitor color matches that from the sodium lamp as at right in the photo, then view both through a didymium filter as at left. |
|
Scattering | |||
O-f4a |
Sunset |
A beam of light shines through a tank of slightly milky water onto the wall. |
|
O-f4b |
Color Due to Scattering - Microscope Slides |
A stack of microscope slides appears white regardless of background. |
|
Polarization | |||
Dichroic Polarization | |||
O-h1a |
Polaroids on the Overhead |
Show polarization with two or three sheets of polaroid on the overhead |
|
O-h1d |
Vanishing Wall |
Put your hand through a "wall" created by a trick of polarization. |
|
O-h1b |
Microwave Polarizing Filter |
Insert a grid of parallel wires (= cookie cooling rack) in a microwave beam and rotate the grid. |
|
O-h1c |
Polarization - Mechanical Model |
Use a grid of parallel wires (= cookie cooling rack) with a vibrating string as a mechanical model for polarization. |
|
Polarization by Reflection | |||
O-h2b |
Reflection off Water |
Reflected light is shown to be polarized. |
|
O-h2a |
Microwave Brewster's Law |
Show that microwave radiation after reflection is polarized. |
|
Circular Polarization | |||
O-h3a |
Karo Syrup |
Insert a beaker of liquid sugar between crossed polaroids. |
|
Birefringence | |||
O-h3p |
Calcite Crystals |
Use a polaroid filter to show the polarization of ordinary and extraordinary rays |
|
O-h3q |
Demonstrating Strain with Crossed Polaroids |
A set of lucite shapes are stressed between crossed polaroids |
|
Polarization by Scattering | |||
O-h5a |
Polarization in the Sunset Demo |
Rotate a Polaroid at the side of the tank in the sunset demo. |
|
The Eye | |||
The Eye | |||
O-j1d |
Molded Eye Model |
Show a molded model of the eye. |
|
O-j1g |
Giant Eye in Bony Orbit Model |
Show a take-apart model of the eye. |
|
O-j1c |
Working Eye Model |
A model demonstrates the focal capabilities of the normal, nearsighted, and farsighted eye. |
|
O-j1e |
Eye Model (Blackboard Optics) |
Show normal, nearsighted, and farsighted blackboard optics eye models, and correct with additional lenses. |
|
Physiology | |||
O-j1f |
Haidinger's Brush |
Detect the polarization of light by observing Haidinger's brush at the center of a bright white screen. |
|
O-j1a |
Purkinje Figures |
Use a penlight under the eye to make the blood vessels in front of the retina visible. |
|
Modern Optics | |||
Physical Optics | |||
O-q2a |
Aperture in back focal plane - laser light |
Use a laser and convex lens to project an image of a grid, and show the decrease in sharpness of the grid's image as the aperture of an iris located at the lens' back focal plane is decreased. |
|
O-q2b |
Aperture in back focal plane - white light |
View the image of a grid in white light, while reducing the aperture in the lens' back focal plane. |
|
Lasers | |||
O-q6a |
HeNe Laser exposed |
Examine an exposed operating HeNe laser cavity with a diffraction grating. |
|
O-q3c |
1W Laser Burning through Materials |
Burn holes in wood, paper, and plastics with a 1W 405nm laser |
|
O-q3b |
Transmitting Sound with Laser |
Modulate the input voltage to a laser pointer with an ipod and use a photocell and speaker to play the sound. |
|
Modern Physics | |||
Quantum Effects | |||
Photoelectric Effect | |||
MO-a1a |
Photoelectric Effect in Zinc |
A charged electroscope attached to a zinc plate discharges when UV light illuminates the zinc. |
|
MO-a1b |
Photoelectric Effect in Cs-Sb photocell |
Plot the stopping potential for various LEDs shining on a Cs-Sb photocell; the intensity versus bias potential may be plotted as well. |
|
Wave Mechanics | |||
MO-a5d |
Vibrating Circular Wire |
A circular wire driven by a function generator produces standing waves at resonant frequencies. |
|
Wave Particle Duality | |||
MO-a5e |
Video: Single-Photon double slit interference |
A camera records the interference pattern due to photons entering a double-slit a single photon at a time. |
|
X-ray and Electron Diffraction | |||
MO-a6a |
Electron Diffraction |
Electrons passing through a carbon target produce a circular diffraction pattern. |
|
Liquid Helium | |||
MO-a7a |
Movie--The Unusual Properties of Liquid Helium |
Isadore Rudnick's 1977 film, 16 minutes long, focusing on many spectacular properties of liquid helium. Transcript available. |
|
Atomic Physics | |||
Spectra | |||
MO-b1a |
Diffraction Grating and Atomic Spectra |
Have students look through a diffraction grating at a spectrum tube. |
|
MO-b1d |
Atomic Spectra Poster |
Poster with atomic spectral lines of Li, Na, K, Ca, Sr, Ba, Zn, Cd, Hg, H, He, Ne, Ar, and Carbon along with the some common absorption lines. |
|
MO-b1f |
Diffraction Grating on Webcam: RSpec |
Display both spectral lines and an intensity plot with a grating-covered webcam. |
|
MO-b1i |
Spectra of Incandescent or LED versus CFL bulbs |
Have students look through a diffraction grating at incandescent and compact fluorescent bulbs. |
|
MO-b1h |
Prism Spectrometer |
Have students look through a prism spectrometer at a sodium lamp. |
|
Absorption | |||
MO-b1b |
Spectrum of Sun |
Point the spectrometer at the sun to see the Fraunhofer absorption lines. |
|
MO-b1g |
Absorption Spectrum - Didymium Glass |
Look at an incandescent lamp through a diffraction grating and a piece of didymium glass. |
|
Resonance Radiation | |||
MO-b1c |
Fluorescent Materials |
Illuminate various fluorescent materials with UV light. |
|
MO-b1e |
Quantum Dots - InP solution |
Four vials of InP quantum dots of different diameter fluoresce with different colors under violet light |
|
MO-b2a |
UV detecting beads |
Put "Ultraviolet Detecting Beads" from Educational Innovations under UV light and they become colorful. Unique Mechanism. |
|
Electron Properties | |||
MO-b3a |
Maltese Cross |
A photon shadow is not effected by either an electric or a magnetic field, but an electron shadow is. |
|
Nuclear Physics | |||
Radioactivity | |||
MO-d1b |
Geiger Counter and Samples |
Listen to the counts from a Geiger Counter brought near to a radioactive sample. |
|
MO-d1a |
Muon Lifetime |
Over the course of a few hours the Teachspin Muon Physics apparatus detects sufficient muon decays to make a rough estimate of the muon lifetime. |
|
Particle Detectors | |||
MO-d3b |
Open-air Alpha Particle Spark Detector |
Sparks fly from a wire grid to a high voltage plate when alpha particles are present. |
|
MO-d3a |
Diffusion Cloud Chamber |
A diffusion cloud chamber shows the tracks from cosmic rays and from alpha, beta, gamma, and X-ray sources. |
|
Elementary Particles | |||
Miscellaneous | |||
MO-e1a |
Video: Large Hadron Rap |
The Large Hadron Rap video |
|
Astronomy | |||
Planetary Astronomy | |||
Solar System Mechanics | |||
A-a1a |
Orrery model |
A motor driven mechanical model of all the planets. |
|
Stellar Astronomy | |||
The Sun | |||
A-b1a |
Solar telescope |
Observe solar flares, prominences, filaments, and sunspots directly with a dedicated telescope with built-in hydrogen alpha filter. We have two telescopes (Coronado PST and Lunt LS50THaPT). |
|
A-b1b |
Observing Sunspots - Sunspotter |
Project an image of the sun, with sunspots and flares, on the screen of the Sunspotter |
|
Cosmology | |||
Models of the Universe | |||
A-c1a |
Expanding Universe |
Pull a rubber hose threaded through five styrofoam balls. |
|
Black Holes | |||
A-c2a |
Membrane Table |
A heavy mass sitting on fabric stretched across the vortx models a black hole in space-time. |