Newton's Cradle is a classic desk toy. Also known as "Balance Balls", "Newton's Pendulum", "Kinetic Balls" and "Newton's Balls", this executive office toy demonstrates the law of conservation of momentum. The motion of this 5-ball cradle is the most addicting way to demonstrate Newton's law of conservation of momentum and energy. As it works its physics magic, the lights change between blue and red and there are 3 different light modes. You can choose whether you want the lights to flash, fade or begin a cycle. Light Source: LED Size: 20cm*15cm*18cm Material: Plastic+ Frosted Glass Batteries: 6 X 1.5V AA alkaline batteries (not included) Package Included: 1 x Kinetic Light Newton's Cradle Balance Ball (Battery is not included). This product need to be assembled by the users themselves.
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