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Unit 4 Quiz#1

Equations:

 

1. What impulse will give a 2.0 kg mass a momentum change of +50 kg m/sec?

  1. +25 N sec
  2. -25 N sec
  3. +50 N sec
  4. +100 N sec


Useful Web Links

Momentum and Impulse Connection (14 seconds)

 

2. A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of ________________.

  1. less than 1 unit
  2. 1 unit
  3. more than 1 unit
  4. not enough information


Useful Web Links

Using Equations as a Guide to Thinking (19 seconds)

 

3. The quantity 1 kg m/sec is equivalent to

  1. 1 N
  2. 1 N sec
  3. 1 N/sec
  4. 1 N/m


Useful Web Links

Momentum and Impulse Connection (14 seconds)

 

4. You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change is momentum?

  1. the bug
  2. your car
  3. both the same


Useful Web Links

The Law of Action-Reaction (Revisited) (8 seconds)

 

5. A 1 kg ball hits a surface perpendicularly with a speed of 3 m/sec and bounces back with a speed of 2 m/sec. The ball undergoes a change in momentum of

  1. 1 kg m/sec
  2. 5 kg m/sec
  3. 3 kg m/sec
  4. 6 kg m/sec


Useful Web Links

Real-World Applications (15 seconds)

 

6. A car with a mass of 1000 kg is moving with a speed of 140 m/sec. The impulse required to bring the car to rest is

  1. 140 N sec
  2. 1400 N sec
  3. 70 000 N sec
  4. 140 000 N sec


Useful Web Links

Momentum and Impulse Connection (14 seconds)

 

7. A 2 N force acts on a mass. If the momentum of the mass changes by 120 kg m/sec, then the force acts for a time of

  1. 8 sec
  2. 30 sec
  3. 60 sec
  4. 120 sec


Useful Web Links

Momentum and Impulse Connection (14 seconds)

 

8. A body of mass 5.0 kg is moving on a smooth surface with a velocity of 6.0 m/sec to the right. A constant force is applied for 3.0 sec, giving the body a final velocity of 12 m/sec to the left. The applied force was

  1. 10 N to the left
  2. 10 N to the right
  3. 20 N to the left
  4. 30 N to the left


Useful Web Links

Momentum and Impulse Connection (14 seconds)

 

9. Impulses are smaller when bounces take place.

  1. True
  2. False


Useful Web Links

Real-World Applications (15 seconds)

 

10. A firecracker falls through the air and explodes. In this example, momentum is not conserved.

  1. True
  2. False


Useful Web Links

Momentum Conservation in Explosions

 

11. The reason car dashboards are padded is to lengthen the time of impact in the case of a collision.

  1. True
  2. False


Useful Web Links

Real-World Applications (15 seconds)

 

12. Which of the following has the largest momentum?

  1. a tightrope walker crossing Niagara Falls
  2. a pickup truck traveling down the highway
  3. a Mack truck parked in a parking lot
  4. the Science building at City college
  5. a dog running down the street


Useful Web Links

Momentum (7 seconds)

 

13. A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is ________________.

  1. zero
  2. quadrupled
  3. doubled
  4. unchanged


Useful Web Links

Momentum (7 seconds)

 

14. In order to catch a ball, a baseball player moves his or her hand backward in the direction of the ball's motion. Doing this reduces the force of impact on the players hand principally because___________.

  1. the resultant velocity of impact is lessened
  2. the momentum of impact is reduced
  3. the time of impact is increased
  4. the time of impact is decreased
  5. none of these


Useful Web Links

Real-World Applications (15 seconds)

 

15. A car traveling along the highway needs a certain amount of force exerted on it to stop. More stopping force may be required when the car has ___________.

  1. more mass
  2. more momentum
  3. all of the above
  4. none of the above


Useful Web Links

Momentum and Impulse Connection (14 seconds)

 

16. Paul D. Trigger fires a bullet. The speed of the bullet will be the same as the speed of the recoiling gun ______________.

  1. because momentum is conserved
  2. because velocity is conserved
  3. because both velocity and momentum are conserved
  4. if the mass of the bullet equals the mass of the gun
  5. none of these


Useful Web Links

Using Equations as a Guide to Thinking (19 seconds)

 

17. A 2 kg ball is thrown at 3 m/sec. What is the ball's momentum?

  1. 2 kg m/sec
  2. 3 kg m/sec
  3. 6 kg m/sec
  4. 9 kg m/sec
  5. none of these


Useful Web Links

Momentum (7 seconds)

 

18. A 4 kg ball has a momentum of 12 kg m/sec. What is the ball's speed?

  1. 3 m/sec
  2. 4 m/sec
  3. 12 m/sec
  4. 48 m/sec
  5. none of these


Useful Web Links

Momentum (7 seconds)

 

19. A ball is moving at 4 m/s and has a momentum of 48 kg m/sec. What is the ball's mass?

  1. 4 kg
  2. 12 kg
  3. 48 kg
  4. 192 kg
  5. none of these


Useful Web Links

Momentum (7 seconds)

 

20. Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be _________________.

  1. zero
  2. the same as before
  3. small, but noticeable


Useful Web Links

The Law of Action-Reaction (Revisited) (8 seconds)

 

21. A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared to the force that stops the car, the force needed to stop the truck is ________________.

  1. greater
  2. smaller
  3. the same


Useful Web Links

Momentum and Impulse Connection (14 seconds)

 

22. A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball that is initially at rest. After the putty sticks to the ball, both are set in motion with a combined momentum that is _______________.

  1. less than 1 unit
  2. more than 1 unit
  3. 1 unit
  4. not enough information


Useful Web Links

Using Equations as a Guide to Thinking (19 seconds)

 

23. A 1 kg chunk of putty moving at a 1 m/sec collides and sticks to a 5 kg bowling ball that is initially at rest. The bowling ball with its putty host is then set in motion with a momentum of ________________.

  1. 0 kg m/sec
  2. 1 kg m/sec
  3. 2 kg m/sec
  4. 5 kg m/sec
  5. more than 5 kg m/sec


Useful Web Links

Using Equations as a Guide to Thinking (19 seconds)

 

24. Two billiard balls having the same mass roll toward each other, each moving at the same speed. What is the combined momentum of the two balls?

  1. 0 kg m/sec
  2. 10 kg m/sec
  3. more information needed to determine.


Useful Web Links

Using Equations as a Guide to Thinking (19 seconds)

 

25. A 1-kg chunk of putty moving at 1 m/sec collides with and sticks to a 5-kg bowling ball that is initially at rest. The bowling ball with its putty host is then set in motion with a speed of ____________.

  1. 1/4 m/sec
  2. 1/5 m/sec
  3. 1/6 m/sec
  4. none of these
  5. not enough information given


Useful Web Links

Using Equations as a Guide to Thinking (19 seconds)

 

 

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© Tom Henderson, 1996-1998


Glenbrook South High School.


Last updated on 9/28/98.