Newton cradle 18 x 15cm Newton's cradle is a popular physical educational gadget. It consists of several metal balls suspended on invisible threads at equal intervals from each other. The Newton cradle is placed on a stable stand, which ensures its balance. Newton's cradle is popular for its simple, but fascinating action. It is often used as an example illustrating the principles of momentum conservation and solid kinetics. In addition, observing balls moving and transferring energy between each other can be relaxing and visually pleasing. Can be easily moved or placed on a desk as a decoration or a play gadget. Principle of operation! When one end of the cradle is lifted and released, the ball at that end falls down and then collides with the other ball. Thanks to the principle of conservation of momentum, kinetic energy is transferred to the last sphere, causing it to rise. At the same time, the first ball that struck stops, and the energy is transferred to the next ball and so on. This process is repeated according to the laws of physics, and the spheres begin to move in a rhythmic way, creating a swaying effect.