Mini Newton's Cradle Balance Ball - A classic physics science desk toy for kids and adults. Decorative piece: Place this Newton's pendulum on your living room table and feel like you're in a psychology lab. Demonstrates the principles of kinetic energy and conservation of momentum. Observe friction and damping effects in action. Educational tool: Own a piece of science history and explore the fascinating principles of physics. Fun gadget: Newton's cradle is a timeless and classic desk science "toy." Use it to pass the time, relieve stress, drown out boring colleagues, or introduce young minds to the wonders of physics. Science toy: When you're tired of studying and working, watch the balls click and relax. You'll love the satisfying sound and mesmerizing motion.