History

• Many people think that the Newton's cradle was created by Sir Isaac Newton but in fact in reality the Newton's cradle was invented in 1967, by English actor Simon Prebble.

• The Newton's cradle is a device that demonstrates the conservation of momentum and the conservation of energy with swinging spheres. 

{Momentum: Product of the mass of a particle and its velocity| Conservation of energy: A principle stating that energy cannot be created or destroyed, but can be altered from one form to another.}

• Newton's cradle is called Newton's cradle because  it demonstrates Newton's third law of motion ["for every action in nature there is an equal and opposite reaction."].

• The Newton's cradle was actually used as a toy that was popular among executives and other elites.