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536 B
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...