physics demonstrated by newtons cradle balance balls china

Newtons cradle balance balls china demonstrates the law of conservation of energy and the law of momentum.

When the first ball is lifted away, it gains gravitational potential energy as it increases in height, while its kinetic energy remains unchanged at zero. After release, the potential energy is converted to kinetic energy as the height of the sphere decreases. All potential energy is converted to kinetic energy at the bottom position. And the ball gains momentum on the downswing, with the most momentum at the bottom.

When it collides with the next ball, the first ball loses all its kinetic energy (and thus all momentum) and runs into a dead end. However, energy and momentum are not lost, so it must be transferred to the ball it hits. The force exerted by the first ball on impact deforms the second ball slightly. Compression is a symbol of energy being transferred in the form of potential energy. As the second ball tries to maintain its original shape, the potential energy is converted to kinetic energy, which is simultaneously passed on to the next ball. The next compression-decompression chain and the resulting energy transfer continues to the final sphere.