XCH Robots, Desk Toys For Office For Adults, Newtons Cradle, 5 Pendulumball Big Newtons Cradle Balance, Metal Balls For Office Toys, Physics Toys, Teacher Toys, Steel Ball Toy by XCH Robots at Education God. MPN: XCH - 002001. Hurry! Limited time offer. Offer valid only while supplies last. XCH Robots Newton's cradle is a device that demonstrates conservation of momentum and energy using a series of swinging spheres. When one sphere at the end is lifted and released, it strikes the stationary spheres, transmitting a force through the stationary spheres that pushes the last sphere upward. The last sphere swings back and strikes the still nearly stationary spheres, repeating the effect in the opposite direction. The device is named after 17th-century English scientist Sir Isaac
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