1. Collisions
Chapter 7.5

2. Collisions Follow Law of Conservation of Momentum 2 types:
Net momentum before collision = Net momentum after the collision
2 types:
Elastic
inelastic

3. Elastic Collisions
When objects collide without being permanently deformed and without generating heat
Colliding objects bounce perfectly

4. Inelastic Collisions Conservation of momentum still holds true
Colliding objects become distorted, coupled or tangled together and generate heat during the collision

5. Example 1:
Suppose you have two 2 kg toy trucks, one that is at rest and one that is moving at a speed of 4 m/s. When the two trucks collide in an inelastic collision, what will be the velocity of the trucks after the collision when they are stuck together?
Net momentum before = net momentum after
(2 kg)(4 m/s) + (2 kg)(0 m/s) = (2 kg + 2 kg)(v)
V= 2 m/s

6. Example 2:
Suppose you have the same two 2 kg toy trucks, one that is at moving at a speed of 2 m/s and the other at a speed of 4 m/s. When the two trucks collide in an inelastic collision, what will be the velocity of the trucks after the collision when they are stuck together?
Net momentum before = net momentum after
(2 kg)(2 m/s) + (2 kg)(4 m/s) = (2 kg + 2 kg)(v)
V= 3 m/s