Name: Period: Momentum In Class Review A. P1+28 PIA + PZA 1. A car speeds up. 7. Which has more momentum? B. PB - 1= 0 2. A person running catches a football. . A fast baseball or a slow baseball? B. A bowling ball or a baseball with the C. 0 = PIA + P2A 3. Two moving cars hit and bounce off. same speed? 4. A moving airplane drops a bomb C. A slow ping pong ball or a house? D. Pa + 1 = PA 5. A rocket at rest turns on its engine: hot 8. What does an impulse equal? E. PIA + P2B = PIA + P2A gases go back; the rocket goes forward. F. PiB + PIB = P1+24 6. A moving car uses its brakes to stop. 9. Does a large force always cause a large impulse? Explain. 10. 15 N acts for 8 seconds. How much momentum was gained? m = 8 N 12. Elastic, Inelastic, or Perfectly Inelastic m= 4 kg 4 kg (could be more than one)? Patier Epbefore = Epanen EEkbefore * EEkaner 12 kym/s 36 kym/s B Epbefore = Epatter, ELikbefore = EEkafter 11. A. How much momentum was gained by the 4 kg object? C. Epbefore = Epafter, and maner = m1+2 D. There is little or no sound. There is a lot of noise. B. How big was the impulse acting on the object? The objects are mangled, or crushed. C. Calculate the time the force acted. 6 kg 4 kg D. Calculate the acceleration of the object. 13. Two objects collide. They don't stick together. A. What happens to the momentum of the 4 kg object? E. What is the final velocity of the object? B. What happens to the momentum of the 6 kg object? C. What happens to the total momentum of the system? Cart 1 Cart 2 6 m/'s 0 m/'s 0.5 sec 6 m/'s 0 m/'s o.1 sec 1.5 kg 1.5 kg 1.5 kg 1.5 kg 14. Two identical carts moving 6 m's stop. The Cart I hits a spring. The Cart 2 just hits a wall. A. Calculate the initial momentum of the carts. B. Calculate the change of momentum of the carts. C. Which cart experienced the bigger change of momentum? D. Which cart felt the bigger impulse? E. Which cart felt the bigger force? Calculate the force on each cart. G. So, to give the same Ap you have two choices:Name: Period: A. What is the mass of the ship? 1.5 kg B. What is the weight of the ship? Calculate the final velocity of the ship. 2,500 kg 800 m/s 15. Slim Jim is also an astronaut. His space ship "Galactic Cruiser" is at rest when he shoots his D. Which has more momentum afterwards: the ship space cannon. or the projectile? 16. A 20 g bullet is shot 800 m's into a 50 kg object that is at rest. 0 m/s A. If 1000 g = 1 kg, change the mass of the bullet to kilograms. 20 g B. What is the mass of the combined object? 50 kg p 50 kg 800 m/s C. What is the initial momentum of the bullet? D. How much momentum does the combined object have afterwards? E. Under the diagram, calculate the final speed of the combined object. F. What kind of collision is this? G. The numbers given are realistic for a bullet and a person. In movies, a bullet causes a person to be thrown backwards violently. How likely is the movie scenario? Explain. Graph 1 Force vs. Time Graph 2 Force vs. Time 0 2.5 5 7.5 10 12.5 15 17.5 20 B Force (N) Force (N) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Time (sec) Time (sec) Use the graphs above to answer the following questions. 18. Force A, B, C, D, or E (could be more than one)? 17. Graph 1 or Graph 2? Is the strongest positive force. A. Shows an object with a positive acceleration Could be an object moving to the right and Is the greatest negative force. B. slowing down. Is the weakest positive force. Will cause the fastest negative acceleration. C. Shows a negative change of speed. D. Shows a force pushing to the left. Is the strongest force pulling left. Shows negative acceleration. 19. Find the impulse of Graph 1. 20. A 2 kg object is moving 6 m/s. What would be its final velocity after the impulse of Graph 1