Newton's Cradle, a desk toy that demonstrates the principles of physics.
Purpose: It illustrates the conservation of momentum and energy through a series of swinging pendulum balls.
Features: Typically features five steel balls suspended by strings from a metal frame with a sturdy base.
Usage: Often used as a decorative desk ornament or a stress-relief fidget toy.
Function: When one ball is lifted and released, it strikes the others, causing the ball on the opposite end to swing up with similar force and height.