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Unit 4 Quiz#1

Equations:

 

Directions:

You may write on (and all over) this quiz; it is especially helpful if you write your name on this page. Answer the multiple choice questions on the Scantron sheet. Solve the last problem on this quiz, showing all your work.

 

Multiple Choice:

1. Momentum may be expressed in

  1. joules.
  2. watts.
  3. kg x m/sec.
  4. newton.


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Momentum (7 seconds)

 

2. If the direction of the velocity of an object is west, the direction of the momentum of the object is

  1. north.
  2. south.
  3. east.
  4. west.


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Momentum (7 seconds)

 

3. An object is brought to rest by a constant force. Which factor other than the mass and velocity of the object must be known in order to determine the magnitude of the force required to stop the object?

  1. the time that the force acts on the object
  2. the gravitational potential energy of the object
  3. he density of the object
  4. the weight of the object


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Momentum and Impulse Connection (14 seconds)

 

4. If an unbalanced force of 6 N acts on an object for 2 seconds, the change in momentum is

  1. 8 kg m /sec.
  2. 6 kg m /sec.
  3. 3 kg m /sec.
  4. 12 kg m /sec.


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Momentum and Impulse Connection (14 seconds)

 

5. A 15-newton force acts on an object in a direction due east for 3.0 seconds. What will be the change in momentum of the object?

  1. 45 kg m/sec due east
  2. 45 kg m/sec due west
  3. 5.0 kg m/sec due east
  4. 0.20 kg m/sec due west


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Momentum and Impulse Connection (14 seconds)

 

6. An unbalanced force of 30 N acts on a 2.0-kg mass for 3.0 seconds. The mass undergoes a change in momentum of

  1. 10 N/sec.
  2. 15 m/sec.
  3. 60 kg N.
  4. 90 kg m/sec.


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Momentum and Impulse Connection (14 seconds)

 

7. 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

  1. 10 N to the left.
  2. 10 N to the right.
  3. 20 N to the left
  4. 30 N to the left.
  5. 30 N to the right.


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Momentum and Impulse Connection (14 seconds)

 

8. A 1-kg ball hits a surface perpendicularly with a speed of 3 meters per second and bounces back with a speed of 2 meters per second. 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.


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Momentum and Impulse Connection (14 seconds)

Real-World Applications (15 seconds)

 

9. A 1.0-kilogram object falls freely from rest. The magnitude of its momentum after one second of fall is

  1. 1.0 kg m/sec.
  2. 5.0 kg m/sec.
  3. 10 kg m/sec.
  4. 20 kg m/sec.


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Determining Speed of Free-Falling Object (8 seconds)

Momentum (7 seconds)

 

Use the following diagram to answer questions #10 and #11.

 

10. In the positions shown in the diagrams, how does the momentum of object A compare with the momentum of object B?

  1. It is one-fourth as great.
  2. It is one-half as great.
  3. It is the same.
  4. It is twice as great.


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Momentum (7 seconds)

 

11. At the top of the hill, the force of gravity on A, compared with that on B, will be

  1. greater.
  2. less.
  3. the same.


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Force of Gravity (8 seconds)

 

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

  1. 4 N down.
  2. 5 N down.
  3. 5 N up.
  4. 10 N up.
  5. zero.


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Balanced and Unbalanced Forces (7 seconds)

Newton's Second Law (9 seconds)

 

Use the following diagram to answer questions #13 - #16. The diagram shows the velocity of a 1,500- kilogram car during a 20-second time interval.

13. The impulse applied to the car during time interval AB is

  1. 9.0 x 104 N sec.
  2. 4.5 x 104 N sec.
  3. 6.0 x 103 N sec.
  4. 1.5 x 104 N sec.


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Momentum and Impulse Connection (14 seconds)

 

14. During which time interval is the acceleration of the car the greatest?

  1. A to B
  2. B to C and D to E
  3. C to D
  4. E to F
  5. F to G


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The Meaning of Slope for a v-t Graph (9 seconds)

 

15. During which time interval is the force acting upon the car directed opposite the car's motion?

  1. A to B
  2. B to C and D to E
  3. C to D
  4. E to F
  5. F to G


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Newton's Second Law (9 seconds)

 

16. During which time interval are the forces acting upon the car balanced?

  1. A to B
  2. B to C and D to E
  3. C to D
  4. E to F
  5. F to G


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Balanced and Unbalanced Forces (7 seconds)

Newton's Second Law (9 seconds)

 

17. 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)

 

18. Miles Tugo is driving down the highway and a bug spatters into the windshield. Which experiences the greatest force?

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


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

     

19. Paul deTrigga fires a rifle. The rifle recoils from firing the bullet. The acceleration of the rifle's recoil is small because the

  1. force against the rifle is less than the force against the bullet.
  2. acceleration is mainly concentrated in the bullet since it is being fired.
  3. rifle has more mass than the bullet.
  4. momentum of the rifle is unchanged.
  5. none of these.


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

Momentum Conservation Principle (16 seconds)

 

20. 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 player's hand 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.


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Real-World Applications (15 seconds)

 

21. 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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Real-World Applications (15 seconds)

 

 

SHOW ALL YOUR WORK FOR THE FOLLOWING PROBLEM:

22. Jocko the clown, who has a mass of 75.0 kg and stands at rest on the ice, catches a 25.0-kg ball that is thrown to him at 15.0 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?

 

 


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Using Equations as a "Recipe" for Algebraic Problem-Solving (12 seconds)

 

 

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Special thanks to lab assistant Carl Bobis for his assistance in converting quiz to HTML format.

© Tom Henderson, 1996-1998


Glenbrook South High School.

Last updated on 9/28/98.