Westminster Classic Newton’s Cradle Balance Balls | 7-Inch Long Desktop Display | Shows Off Conservation of Momentum and Kinetic Energy

Who Knew the Conservation of Momentum and Kinetic Energy Could Be This Fun? Sir Isaac, of course!

This classic desktop display piece has become a must have for office décor. Swing one steel marble back, let it go, and watch as kinetic energy causes the one on the opposite side to swing the same distance!

When one ball on the end is lifted and released, the resulting force travels through the line and pushes the last ball upward.