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Momentum

Momentum. The “P” is Silent. Impulse. Collisions. Conservation of Momentum. Physics is Phun!. The “P” is Silent. Impulse. Collisions. Conservation Of Momentum. Physics is Phun!. 5 pt. 5 pt. 5 pt. 5 pt. 5 pt. 10 pt. 10 pt. 10 pt. 10 pt. 10 pt. 15 pt. 15 pt. 15 pt.

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Momentum

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  1. Momentum

  2. The “P” is Silent

  3. Impulse

  4. Collisions

  5. Conservation of Momentum

  6. Physics is Phun!

  7. The “P” is Silent Impulse Collisions Conservation Of Momentum Physics is Phun! 5 pt. 5 pt. 5 pt. 5 pt. 5 pt. 10 pt. 10 pt. 10 pt. 10 pt. 10 pt. 15 pt. 15 pt. 15 pt. 15 pt. 15 pt. 20 pt. 20 pt. 20 pt. 20 pt. 20 pt. 25 pt. 25 pt. 25 pt. 25 pt. 25 pt.

  8. 1-5 How do you calculate the momentum of an object? 5 pt.

  9. 1-5A How do you calculate the momentum of an object? Momentum = Mass x Velocity 5 pt.

  10. 1-10 True or False? Momentum is a vector quantity. 10 pt.

  11. 1-10A True or False? Momentum is a vector quantity. True 10 pt.

  12. 1-15 What is the momentum of a 0.520-kg object moving at a velocity of 14 m/s? 15 pt.

  13. 1-15A What is the momentum of a 0.520-kg object moving at a velocity of 14 m/s? Momentum = Mass x Velocity p = mv = (0.520 kg)(14 m/s) p = 7.28 kg m/sec 15 pt.

  14. 1-20 Which of the following objects has the greatest Momentum? • a .22-caliber bullet fired from a rifle • a bus speeding along a highway • a sprinter running the 100-yard dash • the Earth in its orbit • not enough info to answer 20 pt.

  15. 1-20A Which of the following objects has the greatest Momentum? • a .22-caliber bullet fired from a rifle • a bus speeding along a highway • a sprinter running the 100-yard dash • the Earth in its orbit • not enough info to answer 20 pt.

  16. 1-25 What is the total momentum of the following situation? Assume there is no friction. 1.5 m/s 0.8 m/s 2 kg 3 kg 25 pt.

  17. 1-25A What is the total momentum of the following situation? Assume there is no friction. 1.5 m/s 0.8 m/s 2 kg 3 kg Momentum of LH-cart = (2 kg)(1.5 m/s) = + 3 kg m/sec Momentum of RH-cart = (3 kg)(- 0.8 m/s) = - 2.4 kg m /sec Total Momentum = + 3 kg m/sec – 2.4 kg m/sec = 0.6 kg m/sec 25 pt.

  18. 2-5 An impulse is equal to which of the following? A) force times distance B) force of impact C) change in kinetic energy D) change in momentum E) none of these 5 pt.

  19. 2-5A An impulse is equal to which of the following? A) force times distance B) force of impact C) change in kinetic energy D) change in momentum E) none of these 5 pt.

  20. 2-10 If a boxer wishes to reduce the force of impact from an incoming punch, what should they do to the time of impact? 10 pt.

  21. 2-10A If a boxer wishes to reduce the force of impact from an incoming punch, what should they do to the time of impact? Increase the time of impact 10 pt.

  22. 2-15 What is the change in momentum of a soccer ball that is kicked with a force of 75-N over a time of 0.18 seconds? 15 pt.

  23. 2-15A What is the change in momentum of a soccer ball that is kicked with a force of 75-N over a time of 0.18 seconds? Change in momentum = impulse = F t F t = (75 N)(0.18 sec) F t = 13.5 N sec 15 pt.

  24. 2-20 A Mack truck and bug are traveling towards one another when they collide head-on. Which one experiences the greater impulse? A) the Mack truck B) the bug C) they both experience the same impulse D) not enough info 20 pt.

  25. 2-20A A Mack truck and bug are traveling towards one another when they collide head-on. Which one experiences the greater impulse? A) the Mack truck B) the bug C) they both experience the same impulse D) not enough info 20 pt.

  26. 2-25 A 1,000 kg rocket is launched from rest to a speed of 2500 m/sec in a time of 2.5 minutes. What was the average force (in Newtons) exerted on the rocket? 25 pt.

  27. 2-25A A 1,000 kg rocket is launched from rest to a speed of 2500 m/sec in a time of 2.5 minutes. What was the average force (in Newtons) exerted on the rocket? Change in momentum = Impulse m v = F t ==> F = m v / t F = (1000 kg)(2500 m/sec)/(150 sec) F = 16,667 Newtons 25 pt.

  28. 3-5 True or False? Momentum is conserved in all kinds of collisions. 5 pt.

  29. 3-5A True or False? Momentum is conserved in all kinds of collisions. True 5 pt.

  30. 3-10 Which kind of collision conserves both momentum and kinetic energy? A) elastic B) inelastic C) both D) neither 10 pt.

  31. 3-10A Which kind of collision conserves both momentum and kinetic energy? A) elastic B) inelastic C) both D) neither 10 pt.

  32. 3-15 Why is it safer to stop an out-of-control car by running into a pond versus hitting a concrete wall? 15 pt.

  33. 3-15A Why is it safer to stop an out-of-control car by running into a pond versus hitting a concrete wall? By running into the pond, the time it takes the car to slow down to a stop is lengthened. Therefore the stopping force is decreased. 15 pt.

  34. 3-20 Why is it that a bouncing collision is more damaging than a sticking collision (assuming the same time of impact in each case)? 20 pt.

  35. 3-20A Why is it that a bouncing collision is more damaging than a sticking collision (assuming the same time of impact in each case)? A bouncing collision is more damaging because the change in velocity, and therefore the change in momentum, is greater. This leads to a larger force. 20 pt.

  36. 3-25 A 0.25 kg ball is hit by a stick - the incoming velocity of the ball is +25 m/sec and the outgoing velocity is - 20 m/sec. If the time of contact is 0.078 sec, what was the force of impact? 25 pt.

  37. 3-25A A 0.25 kg ball is hit by a stick - the incoming velocity of the ball is +25 m/sec and the outgoing velocity is - 20 m/sec. If the time of contact is 0.078 sec, what was the force of impact? Impulse = Change in Momentum F t = m v ==> F = m v / t F = (0.25 kg)(-45 m/sec)/(0.078 sec) F = -144.2 Newtons 25 pt.

  38. 4-5 When an asteroid collides with the Moon, the Moon drastically changes the momentum of the asteroid. By how much does the Moon change its momentum? 5 pt.

  39. 4-5A When an asteroid collides with the Moon, the Moon drastically changes the momentum of the asteroid. By how much does the Moon change its momentum? Precisely the same amount 5 pt.

  40. 4-10 A firecracker is sitting on the ground when it is lit. After the explosion, what is the total momentum of the pieces flying away? 10 pt.

  41. 4-10A A firecracker is sitting on the ground when it is lit. After the explosion, what is the total momentum of the pieces flying away? Zero!!! …because the momentum of the firecracker before the explosion was zero, and momentum must be conserved. 10 pt.

  42. 4-15 A bullet is fired from a heavy rifle. Two questions: Which one experiences a greater change in momentum? Which one experiences a greater change in velocity? 15 pt.

  43. 4-15A A bullet is fired from a heavy rifle. Two questions: Which one experiences a greater change in momentum? Which one experiences a greater change in velocity? NIETHER!!! They are the same. The Bullet. 15 pt.

  44. 4-20 Two billiard balls collide elastically on a table as shown below. Which picture best represents the motion of ball #2 after the collision? #2 B A C Bonk! #1 #1 20 pt.

  45. 4-20A Two billiard balls collide elastically on a table as shown below. Which picture best represents the motion of ball #2 after the collision? #2 B A C Bonk! #1 #1 20 pt.

  46. 4-25 Your Team may wager from 0-50 pts. Type Question Here You must make your wager BEFORE the Daily Double is revealed!!! 25 pt.

  47. 4-25A Daily Double Daily Double 2.5 m/s 1.8 m/s Momentum of LH-cart = (3 kg)(2.5 m/s) = +7.5 kg m/s Momentum of RH-cart = (2 kg)(-1.8 m/s) = -3.6 kg m/s Total Momentum = +3.9 kg m/s After collision ==> 3.9 kg m/s = (5 kg)v v = (3.9 kg m/s)/(5 kg) = +0.78 m/sec 3 kg 2 kg Daily Double

  48. 5-5 How many triangles are there in this figure? 5 pt.

  49. 5-5A 35 5 pt.

  50. 5-10 Name the actor and movie that produced this famous quote: “Boards don’t hit back.” 10 pt.

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