### Impact And Collision

# Impulse and Momentum

**Impulse:**

- Vector quantity that measures the change in momentum
- Equals the product of net force applied and time
- Measured in newton-seconds (N·s)

# Elastic and Inelastic Collisions

* Elastic:* Kinetic energy of system conserves

* Inelastic Collision**- Part of the System´s kinetic energy dissipates into different energy types (heat, sound)

# Coefficient of Restitution

- Measures collision elasticity
- Ratio of velocity of post-collision objects & their pre-collision velocity
- Coefficients:0 (inelastic)<–>1(elastic)

# Conservation of Momentum

- States sum of momenta from a closed system’s items stays constant.