1. Chapter 5
Test Prep Game

2. A 50 kg skater slows down from 2. 0 m/s to 1. 0 m/s
A 50 kg skater slows down from 2.0 m/s to 1.0 m/s. What is his change in Kinetic Energy?
25 J
100 J
75 J
150 J

3. How much work is required for a 60 kg woman to walk up a 2 m ramp to a height of 1 m above the ground, carrying a 40 kg box?
980 J
588 J
1960 J
1176 J

4. A stationary 4-N soccer ball is kicked with a force of 5 N for a distance of 0.1 m before it rolls an additional 10 m. How much kinetic energy does the ball gain from the kick?
9 J
0.5 J
0.9 J
50 J

5. In which of the following cases is no work done?
A weightlifter lifts a barbell.
A weightlifter holds a barbell overhead.
A weightlifter slowly lowers a barbell.
A weightlifter drops a barbell and the barbell falls to the ground.

6. You lift a 4. 5-kg box from the floor and put it on a shelf 1
You lift a 4.5-kg box from the floor and put it on a shelf 1.5 m above the ground. How much energy did you use?
9.0 J
49 J
11 J
66 J

7. Which is the equation used to calculate the work done on an object by a force at an angle to the displacement?
W = Fd
W = Fdcosθ
W = Fdsinθ
W = mgsin θ

8. A Joule is equivalent to:
N/m Nm
Kgm/s2

9. Energy that is due to motion of an object is:
Potential Energy
Gravitational Potential Energy
Kinetic Energy
Elastic Potential Energy

10. What do you divide work by to calculate power?
Time
Distance
Force
Weight

11. Lifting a stone block 146 m to the top of the Great Pyramid required 146,000 J of work. How much work was done to lift it halfway to the top?
36,500 J
146,000 J
73,000 J
292,000 J

12. A motor applies a 5000-N force to raise an elevator 10 stories
A motor applies a 5000-N force to raise an elevator 10 stories. If each story is 4 m tall, how much work does the elevator do?
200,000 J
50,000 J
20,000 J
5,000 J

13. Calculate the power, in watts, needed to mow a lawn in 50 minutes if the work required is 500,000 J.
2,500 kW
5,000 W
167 W

14. Which of the following is transferred when work is done?
Distance
Energy
Force
Power

15. Which does more work on an object?
Pushing a 50-N object a distance of 2 m
Pushing a 120-N object a distance of 7 m
Pushing a 150-N object a distance of 5 m
Pushing a 300-N object a distance of 1 m

16. How does the Kinetic Energy of an object change if the object’s speed doubles?
Decreases by half the original value
Quadruples
Doubles
Decreases by ¼ of the original value

17. Which of the following does not affect potential energy?
An object’s mass
An object’s height
An object’s speed
Free-fall acceleration

18. Which of the following is true of the conservation of energy in a closed system?
Kinetic Energy is always conserved.
Potential Energy is always conserved.
Mechanical Energy is always conserved.
Total Energy is always conserved.

19. Which of the following is not a form of Mechanical Energy?
Kinetic Energy
Chemical Energy
Gravitational Potential Energy
Elastic Potential Energy

20. A 0. 07 kg egg suspended above the ground has 2
A 0.07 kg egg suspended above the ground has 2.0 J of potential energy. If it is dropped, what is the velocity of the egg right before impact?
28.6 m/s
2.9 m/s
0.76 m/s
7.6 m/s

21. Which of the following is the rate at which energy is transferred?
Power
Work
Mechanical Energy
Kinetic Energy

22. How much work can a motor with a power output of 25 W do in 1 second?
1/25 J
1 J
25 J
25 W

23. A man pushes a 10-kg box with a 33 N force a velocity of 2 m/s
A man pushes a 10-kg box with a 33 N force a velocity of 2 m/s. What is the power?
3.3 W
66 W
330 W
16.7 W

24. How much Kinetic Energy does an 82-kg hockey player skating 10 m/s have?
820 J
8200J
410 J
4100 J

25. A car transported by ship is raised 7
A car transported by ship is raised 7.3 m above the dock giving it a Potential Energy of 66,375 J. What is the car’s mass?
9092 kg
484,537 kg
928 kg
49443 kg

26. Through what height could a 1000-N object be lifted to expend the same amount of power of a 60-W bulb for 6 hours?
650 m
1300 m
430 m
360 m

27. 4. 0 J of work is performed to stretch a spring with k=2500 N/m
4.0 J of work is performed to stretch a spring with k=2500 N/m. How much is the spring stretched?
5.7 cm
0.3 cm
5.7 m
3.2 m

28. Which of the following is not an example of an exchange between Kinetic and Potential Energy?
A ball being thrown in the air
Water from a drinking fountain
Flipping a pancake
Running around an oval track

29. How large a force is needed to accelerate a 1600 kg car from rest to a speed of 25 m/s in a distance of 200 m?
1600 N
200 N
2500 N
400 N

30. What is the power generated by a hydroelectric power plant with a 8900 kg/s water source that involves a 30-m drop?
7.2 kW
2.6 MW
2.6 kW
7.2 MW

31. In a bicep curl, a weightlifter lifts a mass of 15 kg a vertical distance of 66 cm. How much work is done on the mass?
990 J
97 J
101 J
43 J