Relaxdays Newton?s Cradle, Pendulum for Desk & Office

Perpetual motion for the desk. The delicate metal ball pendulum captivates not only physics enthusiasts. The operation of the ball pendulum is as simple as it is fascinating, playfully demonstrating the law of conservation of momentum: when one of the outer balls is displaced and then strikes the stationary balls, the same number of balls on the opposite side is set into motion. The pendulum balls are a classic decorative element for the office and desk, and they also have a calming effect.