# Collision A collision is a broad term that describes any event where two or more bodies exert forces on each other for a relatively short time. The [[Hertz Law]] describe the contact between two elastic solids. There is also [[Inelastic Collisions]]. # Impact An impact is a type of collision with a high force over a short duration. (see [[Impact Models]]) # Shock A shock is a transient high force event with clearly defined parameters for testing purposes. Can be an impact, an other type of collision, an explosion, etc...