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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.

Fishbane Chapter:   7.1
HRW 9th:   8.08
Reese Chapter:   8.9
RHK 5th:   12.3
SJ 3rd Chapter:   7.4
PIRA DCS classification:   1M40.15

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