Newton's Cradle
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A Newton's cradle, also known as a Newton's rocker or ball clicker, was named after the famous physicist Isaac Newton in 1967 by Englishman Simon Prebble. Despite popular misconception, it has nothing to do with Newton swinging as a child. This toy demonstrates three fundamental physics principles: conservation of energy, conservation of momentum and friction. The source of this information is http://science.howstuffworks.com/newtons-cradle.htm.
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