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Happy and Unhappy Balls M-r4a
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. Fishbane Chapter:   8.3 HRW 9th:   9.07 Reese Chapter:   9.5 RHK 5th:   6.5 SJ 3rd Chapter:   8.3 PIRA DCS classification:   1R40.30

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
The Johns Hopkins University