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- 1. Multiple Choice
Which of the choices is the best description of work?
a quantity that describes when an object is moved over a distance by a force applied to the object in the direction that it is moving
the net force acting on an object
the amount of work done in a given amount of time
the stored energy of an object due to its position
- 2. Multiple Choice
Which of the statements regarding the concept of work in physics are true?
Work is a scalar quantity.
Work is measured by sweat.
Work depends on the angle between the applied force on an object and the object's displacement.
Pushing against an immovable object is an example of work being done.
Work can be positive, negative, or zero.
- 3. Multiple Choice
Work is done…
On a toy car as you push it around the floor
On the locked door that remains closed while you try to pull it open
On books as you lift them and place them on the bookcase
On the door as your push against it and open it.
On the bowling ball that you are holding while waiting for your turn to bowl.
- 4. Multiple Choice
A sled is pulled horizontally across the snow for a distance of 53 m by a force of 124 N. How much work is done on the sled?
2.9 J
6600 J
.35 J
6572 J
- 5. Multiple Choice
A worker pushes a box across the floor with a force of 101N for a distance of 23.0 m. How much work was done on the box by the worker?
2320 J
7.87 J
.127 J
2323 J
- 6. Multiple Choice
An ant pushes a piece of a leaf across the ground using a force of 0.000344 N for a distance of 5.7 m.
How much work was done by the ant on the leaf?
0.0020 J
0.00196 J
4900 J
4942 J
- 7. Multiple Choice
Which of the choices is a correct description of the work-energy theorem?
The work on an object can be determined by subtracting the initial kinetic energy from the final kinetic energy.
The work on an object can be determined by finding how many times larger the final kinetic energy is than the initial kinetic energy.
The work on an object can be determined by finding the sum of both the initial and final kinetic energy.
The work on an object can be determined by subtracting the final kinetic energy from the initial kinetic energy.
- 8. Multiple Choice
The work-energy theorem defines the relationship of the net work on an object and the change in the kinetic energy of the object.
Based on the the work-energy theorem, if the net work on an object is more than 0 J, the kinetic energy of the system will...
Increase
Decrease
Remain Constant
- 9. Multiple Choice
Use the work-energy theorem to determine the amount of work it would take to change the kinetic energy of an object from 2814 J to 7456 J.
-4642 J
4642 J
10270 J
-10270 J
- 10. Multiple Choice
How much work would it require to take a speed boat from an initial kinetic energy of 5725 J to a final kinetic energy of 1391 J?
4334 J
-4334 J
7116 J
-7116 J
- 11. Multiple Choice
A runner initially has 245 J of kinetic energy but then speeds up and has 327 J of kinetic energy.
82.0 J
- 82.0 J
560 J
-560 J
- 12. Multiple Choice
How much work would have been done on a bicycle if the kinetic energy of the bicycle went from 287 J to 1465 J?
1178 J
-1178 J
1752 J
5.10 J
- 13. Multiple Choice
If 319 J of work is done on a soccer ball with an initial kinetic energy of 499 J, calculate the final kinetic energy of the soccer ball.
J
818 J
-818 J
J
- 14. Multiple Choice
A runner initially has 254 J of kinetic energy. Then he speeds up and does 765 J of work.
What is the final kinetic energy of the runner?
330 J
1020 J
-1020 J
19000 J
- 15. Multiple Choice
Gravity does 321 J of work while a bowling ball rolls down a hill.
If the final kinetic energy of the ball was 410 J, what would be the value of the initial kinetic energy of the bowling ball?
89 J
-89 J
730 J
1.7 J
- 16. Multiple Choice
Which of the choices is the best definition of power?
the amount of work done in a given amount of time
a quantity that describes a push or pull
the amount of force applied over a distance
the ability of an object to change its state or the environment
- 17. Multiple Choice
A student is studying the power generated by a weightlifter lifting masses from the ground to her shoulders.
Which of the options can increase the amount of power generated? Select all that apply.
decrease the time taken to lift the masses
increase time taken to lift the masses
hold the masses at her shoulders for an additional 10
10 s
lift the masses over her head instead, in the same amount of time
- 18. Multiple Choice
In the distance you see a hill. From your perspective, the hill has a left side and a right side. The left side of the hill has a steeper slope than the right. On top of the hill is a man and a boulder. He will choose one side of the hill to roll the boulder down to the bottom.
Which of the statements is true about the power delivered to the boulder at the bottom of the hill? Assume the hill has the same altitude on both sides. Neglect any friction.
More power is delivered rolling down the left side.
More power is delivered rolling down the right side.
The same power is delivered rolling down either side.
The relation between the powers delivered cannot be determined.
- 19. Multiple Choice
A horse pulls a carriage using a force of 1325 N for a distance of 135 m. If it took the horse a total of 75.8 s to complete this distance, what is the power output of the horse?
2390 W
736 W
2360 W
1.8 W
- 20. Multiple Choice
A car tows a boat using a force of 3825 N for a distance of 1125 m. If it takes the car a total of 62.0 s to complete this distance, what is the power output of the car?
71300 W
61.7 W
71256 W
69400 W
- 21. Multiple Choice
A toy car has a mass of 15.3 kg. It starts from rest and is driven at a constant acceleration of 0.91 m/s2 for 43.3 s. It travels a distance of 17.3 m before it crashes into a wall and the engine dies.
How much power had the car's engine used to propel the car before hitting the wall?
4.4 W
0.29 W
5.6 W
6.6 W
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