1. Momentum The strength of an object’s motion. Momentum is NOT a force. This cement truck has a lot of momentum. It does not HAVE force, but it could exert a lot of force !

2. Momentum Depends on the mass and velocity of the object. P = mv where, p = momentum m = mass v = velocity Typically measured in g m/s or kg m/s.

3. Law of Conservation of Momentum The total amount of momentum before and after a collision is always the same. Momentum is transferred between the colliding objects.

4. A car with a mass of 1200kg is moving at 25.0m/s. It collides head-on with a 1500kg car at rest. 1)How much momentum did the first car have before the collision? 2)How much momentum did the second car have before the collision? 3)What is the total amount of momentum of the two cars before the collision? 4)What is the total amount of momentum of the two cars after the collision? 5)If the first car transfers all of its momentum to the second car, how fast will the second car be traveling after the collision?

5. Check Up - Momentum 1.Which has more momentum, a baseball or a bowling ball? a)Baseball b)Bowling ball c)They have equal momentum d)Can’t tell from information given

6. Momentum depends on the mass AND velocity of the object. If you do not know the velocity of each ball, you don’t know which has the greater momentum.

7. Check Up - Momentum 2.How could a baseball have more momentum than a bowling ball? a)Make the baseball move faster than the bowling ball. b)Make the bowling ball move faster than the baseball. c)Make the two balls move at the same speed. d)Make both balls be at rest.

8. a) Make the baseball move faster than the bowling ball. If the baseball, with the smaller mass, is moving faster than the bowling ball, with the greater mass, the two objects could have the same momentum. m v = m v

9. d) Make both both balls be at rest. ALSO: If both balls are at rest, neither one has any momentum. m 0 = m 0 0 = 0