1. Momentum

2. Which is harder to stop:
A large truck
A small car
Momentum is “inertia in motion”
Mass x Velocity

3. Conservation of Momentum
In the absence of external forces, the momentum of a system remains unchanged.

4. Collisions
Conservation of Momentum
The momentum of the objects before the collision is equal to the momentum of the objects after the collision.
2 types: Elastic and Inelastic

5. Elastic Collisions
One object hits another….transfers its momentum…stops…and the 2nd object starts to move.

6. Conservation of Momentum
Inelastic Collisions
You are hovering next to the space shuttle in earth-orbit and your buddy of equal mass who is moving 4 m/s (with respect to the ship) bumps into you. If she holds onto you, then how fast do the two of you move after the collision?
Two astronauts move together with a velocity of 2 m/s after the collision.
One object hit another….the 2 object stick together and keep moving.

7. Inelastic Collisions

8. Inelastic Collisions

10. Momentum Problem
A train car with a mass of 2000kg is traveling at 20 m/s when it collides with and sticks to another car with a mass of 1000kg and continues to move. What is the velocity of the two trains after the collision?
Packet: Ambrose
and Granny