1. Momentum & Impulse Aim: How does the mass and velocity affect an object’s motion?

2. Momentum The product of an object’s mass and velocity Mass Units: Kilograms (kg) Velocity Units: (m/s )

3. Example #1 Drew Brees (95kg) is stationary when he throws a 0.43kg football at a speed of 42m/s. Between Drew Brees and the football, which one has (a) more inertia; and (b) more momentum? Why? a) b)

4. Example #2 Calculate the momentum that a 1900kg truck can have when it travels at 20m/s. (b) How fast must a 1100kg car travel in order to match the truck’s momentum a) b)

5. Example #3 A 100kg running back runs east at a velocity of 5m/s. At the same time, a 125kg linebacker runs at 4m/s west towards the running back. Are the momenta of the football players the same?

6. Impulse An object’s CHANGE in MOMENTUM Net Force Units: Newtons (N) Time Units: (s )

7. Example #4 PSY kicks 0.5kg soccer ball with a force of 1000N. The ball experiences an impulse of 300Ns. How long was PSY’s foot in contact with the ball?

8. Example #5 A 46g golf ball initially at rest is hit with a driver that causes it to travel at a velocity of 50m/s. If the golf club is in contact with the ball for 2ms, what is the average force the ball experiences?

9. Example #6 A boy kicks a 0.3kg ball against the wall. If the velocity of the ball is 10m/s and bounces back with a velocity of 8m/s, calculate the impulse imparted on the ball by the wall.

10. Car Air Bags Air bags INCREASE the amount of time for your body to stop when in an accident Due to the impulse equation, the SHORTER the time to stop requires MORE Force; however, the LONGER the time to stop requires LESS force

11. SUMMARY How do you calculate momentum? What are the units for momentum? Is momentum different if the object travels in different directions? Describe Impulse How do you calculate impulse? What are the units for impulse?