1. Momentum and Impulse Review 1.The velocity of a moving mass is called? ans: momentum 2.Force applied in a period of time is called? ans: impulse 3. The formula for momentum is: ans: p = mΔv 4. The units for momentum is: ans: Kg m/s

2. 5. The unit for impulse is: ans: N s 6. The conservation of momentum states that: ans: total momentum before and after an event must be the same. 7. In an inelastic collision the two object will: ans: stick together 8. In an inelastic collision, when the masses stick together, the mass increases and the velocity will _______________ ans: decrease

3. 9. In an inelastic collision, the kinetic energy is ____________ conservated? ans: NOT 10. In an elastic collision, the kinetic energy is _____________? ans: conserved 11. What is the equation that related impulse to momentum? ans: FΔt = mΔv

4. 12. A 0.15 Kg ball, moving in the positive direction at 12 m/s is acted upon by a constant force of 2N for 4 s. What is the final velocity of the ball? ans: 65.33 m/s 13. A hockey player takes a shot on goal with a puck of 0.115 Kg. The puck strikes the pole at 37 m/s and bounces off at 25 m/s. What is the impulse on the puck? ans: -7.13 Kgm/s

5. 14. In the situation in #13 above, if the collision occurred in 5 x 10 -4 s, what is the average force on the puck? ans: -14 260 N 15. In an elastic collision a 45 kg mass traveling at 2 m/s to the right collides with a 38 Kg mass traveling at 2.5 m/s to the left. What is the change in the kinetic energy of this system? ans: KE before = KE after, conserved

6. 16. A 3650 Kg truck traveling to the east when breaks are applied exerting a force of 9700 N. The truck slows from 32 m/s to 9 m/s. a. How many seconds does the truck require to decelerate to the 9 m/s? b. How far does the truck travel during the period of deceleration?

7. 17. Two object collide in an elastic collision. Object one has a mass of 0.75 Kg and is moving at 2.5 m/s to the right and object two has a mass of 0.50 Kg moving to the left. The two object collide head on. After the collision one continues traveling to the right at 1.5 m/s and object two moves to the right at 3.0 m/s. a. What is the original velocity of object two? b. What is the total change in the kinetic energy of this system?

8. 18. A 35 500 Kg cart is sliding down an incline at 2.0 m/s. Workers run a rope across the incline to retard the cart motion. The rope applies a force of 56 000 N of force. a. How much time is needed to bring the cart to rest? b. How far will the cart move in the first 0.75 s ? c. How far with the cart slide before the cart comes to rest?

9. 19. A 0.144 kg ball is thrown horizontally at +38 m/s. After the ball is hit by a bat, the ball moves horizontally at -38 m/s. a. What impulse did the bat deliver to the ball? b. If the bat and ball were in contact for 0.8 ms, what was the average force the bat exerted on the ball? c. Find the average acceleration of the ball during the time the bat is in contact with the ball.

10. 20. A 0.115 kg hockey puck approaches a player with a velocity of 4.2 m/s. The play bumps the puck giving it a velocity of -1.25 m/s. What average force did the player apply if the time of contact was 0.15 s?

11. 21. A force of 186 N acts on a 7.3 kg object for 0.4 s. What is the momentum of the object and what is the velocity of the object as a result?

12. 22. A 0.035 kg bullet strikes a 5 kg block of wood setting at rest. The bullet and the block combine in mass. After this collision the black and the bullet move at 8.6 m/s. What is the velocity of the bullet before it strikes the wood?