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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. unchanged

b. zero

c. quadrupled

d. doubled

 

2. An object of mass m undergoes a velocity change of Dv in a time of t seconds; this results in a force of F. If the mass is reduced to 1/4 m and the time increased to 2t, then the new force would be

a. 2F

b. 6F

c. 8F

d. (1/8)F

e. (1/2)F

 

3. The diagram below depicts the changes in velocity of a ball which undergoes a collision with a wall. Indicate which case (A or B or both the same) has the greatest change in velocity, greatest acceleration, greatest momentum change, and greatest impulse.

 

Greatest Ăv? _____
Greatest Ăp? _____
Greatest FĂt? _____
Greatest a? _____

4. A large truck and a Volkswagon have a head-on collision. Answer T (truck), VW (Volkswagon) or S (both the same).

a. Which vehicle experiences the greatest force of impact? ______________

b. Which vehicle experiences the greatest acceleration? ______________

c. Which vehicle experiences the greatest impulse? ______________

d. Which vehicle experiences the greatest momentum change? ______________

 

5. Rhonda, who has a mass of 40.0 kg, is riding at 30.0 m/s in her sports car when she must suddenly slam on the brakes to avoid hitting a dog crossing the road. She is wearing her seat belt, which brings her body to a stop in 0.200 s. What average force does the seat belt exert on her? PSYW

 

 

 

6. A force of 500 N causes a 80-kg fullback to change his velocity by 8 m/s. Determine the impulse experienced by the fullback. PSYW

 

 

 

7. An 900-kg car is brought from 32 m/s to 24 m/s over a time period of 3.0 seconds. Determine the force experienced by the car. PSYW

 

 

 

 

8. 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 10.0 km/hr. Jocko catches the ball and slides across the ice after the "collision". With what speed 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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Last updated on 12/9/04.