Newton's Cradle
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The Newton's Cradle is a popular physics demonstration tool that illustrates the law of conservation of momentum and energy. The device consists of a series of equally spaced, hollow spheres hanging from a support bar. When one sphere on one end is forcefully moved, it collides with the other spheres causing them to swing. Surprisingly, the number of spheres in motion remains constant despite the transfer of momentum between the spheres.
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