(see [[Vibration_Mechanical_Shock_And_Impact.pdf]])
# 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]].

Collision analysis often emphasizes momentum exchange
# Impact 

An impact is a type of collision with a high force over a short duration.

(see [[Impact Models]])

Impact analysis considers material deformation and damage

# Shock

A shock is a sudden acceleration caused by various events, including impacts.
Key characteristics of shock include:

- A transient physical excitation
- Extreme rates of force with respect to time
- Measured as a vector with units of acceleration (often in multiples of g)

Shock analysis concentrates on acceleration and its effects on structures