core physical principles of newtons cradle balance balls products

Newtons cradle balance balls products can be approximated as perfectly elastic collisions.

Ideally, the physical process of a perfectly elastic collision satisfies the conservation of momentum and energy. If the masses of the two colliding balls are equal, the equations of conservation of momentum and conservation of energy can be solved simultaneously: the two balls exchange velocities after collision.

If the collided ball was originally stationary, after the collision, the ball has the same speed as the colliding ball, and the colliding ball stops. A similar analysis can be done when multiple balls collide. In fact, because the collision between the balls is not an ideal elastic collision, and there will be a loss of energy, the balls still have to stop in the end. This is also the core physical principle of newtons cradle balance balls products.