Most recent change of Pendulum
Edit made on August 18, 2011 by ColinWright at 16:51:02
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Studied by Galileo.
It was thought that the time for each swing of a pendulum is constant,
but it's now known that this is only true for very small swings.
The motion of a pendulum is an example of simple harmonic motion.
You can use a pendulum indirectly to measure acceleration due to gravity: