Is a collision between two billiard balls an elastic collision?

Yes, a collision between two billiard balls is generally considered an elastic collision. In an elastic collision, both momentum and kinetic energy are conserved. Billiard balls are designed to maintain their shape and energy during collisions, allowing them to rebound off each other without losing energy to deformation or heat. Thus, the typical interactions between billiard balls exemplify the characteristics of elastic collisions.