Newton's classical cradle, designed for swinging and colliding with rhythmic motion.

Newton's cradle, a device that demonstrates the principle of conservation of momentum and energy. Its most important features: 1. Design: consists of several polished metal balls hanging in a row. 2. Function: when one ball from the end is lifted and released, it collides with the stationary balls, transferring energy along the line, pushing the ball at the other end outward. 3. Materials: usually made of metal balls and a sturdy frame. 4. Base: often has a fixed base to ensure smooth operation. 5. Visual attraction: used as a desktop toy and educational tool to demonstrate physics concepts. It is a common educational tool and decorative element used in offices or homes.