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Mechanics help explain how the natural forces of nature work. Here you can learn about everything from gravity to friction.

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How Newton’s Cradles Work

Five metallic balls on slender threads sit side by side. As one on the end hits the rest, the one on the opposite end rises and falls. Why don't the balls in the middle move? It's complicated.


How Newton’s Cradles Work

How Newton’s Cradles Work

The swinging spheres of Newton's cradles show how momentum and energy are conserved as they transfer force to each other. Read more about Newton's cradles. See more »