What makes some collisions elastic and others inelastic?

Responses

If there is no loss of kinetic energy in the collision, it is elastic.

If there is no loss of kinetic energy in the collision, it is elastic.

If the collision involves sticking together, it is elastic.

If the collision involves sticking together, it is elastic.

If there is energy lost in the collision to sound, heat, etc., the collision is elastic.

If there is energy lost in the collision to sound, heat, etc., the collision is elastic.

If the collision involves bouncing, it is elastic.

If the collision involves bouncing, it is elastic.