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Unit 4, Quiz #1

 

1. 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 ________________.

a. zero

b. quadrupled

c. doubled

d. unchanged


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Momentum (7 seconds)

 

2. Impulses are smaller when bounces take place.

a. True

b. False


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Real-World Applications (15 seconds)

 

3. A karate expert executes a swift blow and severs a cement block with her or his bare hand. The

  1. impulse on both the block and the expert's hand have the same magnitude.
  2. force on both the block and the expert's hand have the same magnitude.
  3. time of impact on both the block and the expert's hand is the same.
  4. all of the above.
  5. none of the above.


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Momentum Conservation Principle (16 seconds)

 

4. A rocket cannot accelerate in outer space because ...

  1. there is no air in space
  2. there is no friction in space
  3. there is no gravity in outer space
  4. both a and b
  5. ... nonsense! Rockets do accelerate in outer space.


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

 

5. 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 change is reduced.
  3. the time of impact is increased.
  4. the time of impact is decreased.
  5. none of these.


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Real-World Applications (15 seconds)

 

6. 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. only if the mass of the bullet equals the mass of the gun
  5. none of these


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

 

 

7. Three books, X, Y, and Z, rest on a table as shown in the diagram at the right. The weight of each book is indicated. The net or unbalanced force acting on book Y is

a. 4 N down.

b. 5 N down.

c. 5 N up.

d. 10 N up.

e. zero.


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Balanced and Unbalanced Forces (7 seconds)

 

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

a. the bug

b. your car

c. both the same


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Momentum Conservation Principle (16 seconds)

 

 

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

a. +25 N sec

b. -25 N sec

c. +50 N sec

d. +100 N sec


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Momentum and Impulse Connection (14 seconds)

 

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

a. 10 N to the left.

b. 10 N to the right.

c. 20 N to the left

d. 30 N to the left.

e. 30 N to the right.


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Momentum and Impulse Connection (14 seconds)

 

11. A 2 kg ball hits a surface perpendicularly with a speed of 5 m/sec and bounces back with a speed of 2.5 m/sec. Determine the momentum change of the ball. PSYW


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Momentum and Impulse Connection (14 seconds)

 

12. A 2 N force acts on a 10-kg mass. If the momentum of the mass changes by 120 kg m/sec. Determine the time over which this force acts. PSYW


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Momentum and Impulse Connection (14 seconds)

 

13. A 1000-kg car have traveling with a velocity of -35 m/s collides with a 4000-kg truck traveling with a velocity of +10 m/s collides. Both the truck and the car are traveling in the same direction. The truck and car entangle and move together with the same velocity after the collision. Use the law of conservation of momentum to determine the velocity of the truck and car immediately after the collision. PSYW


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Solving Momentum Problems (12 seconds)

 

 

 

14. Jocko the clown, who has a mass of 60.0 kg and stands at rest on the ice, catches a 15.0-kg ball that is thrown to him at 20.0 km/hr. Jocko catches the ball and slides across the ice after the "collision". How fast does Jocko (and the ball) move across the ice after the collision? Organize your work (a momentum table is a great idea) and show a clear solution to the problem Accompany your answer by appropriate units.


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Solving Momentum Problems (12 seconds)

 

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© Tom Henderson, 1996-1998


Glenbrook South High School.

Last updated on 12/14/98.