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There are three experiments here demonstrating centripetal force. One experiment
is a ball on a string that is whirled in a circle above your head. When
the string is released the ball travels off in a straight line. The second
experiment is a coat hanger with a penny. The penny is balanced on the
tip of the hook and then the coat hanger is whirled in a vertical circle
as the penny stays on the tip. The last experiment is a bucket of water
that is also whirled in a vertical circle and the water stays in the bucket.
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