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This is a Newton's Cradle, also known as Newton's Balls or the Executive Ball Clicker. This model demonstrates three key principles in physics: conservation of energy, conservation of momentum, and friction. When two objects collide, the total momentum before the collision is equal to the total momentum after the collision. In Newton's Cradle, when the first ball strikes the second, it comes to a stop, but its momentum is transferred through each successive ball until it reaches the last. The last ball then swings outward with nearly the same momentum as the first. Similarly, if two balls are lifted and released, two balls on the opposite end will swing in response.
