Pendulum

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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.

You can use a pendulum indirectly to measure acceleration due to gravity:

• http://wings.avkids.com/Curriculums/Forces_Motion/pendulum_howto.html
• http://www.google.com/search?q=pendulum+measure+gravity