Physicists call this an elastic collision even though no contact actually occurs.

In the case of playing pool or bouncing a ball, an elastic collision occurs.

With purely elastic collisions, the total amount of kinetic energy in the system remains the same.

In an elastic collision these magnitudes do not change.

This energy is lost and not returned as an elastic collision.

He studied elastic collisions in the 1650s but delayed publication for over a decade.

The point interacts with the wall by the law of elastic collision.

The air track is also used to study collisions, both elastic and inelastic.

Still, the origin of the effect can be considered as an elastic collision between a photon and an electron.

An elastic collision is one in which no kinetic energy is lost.