Physics C: Work and Work Energy Theorem
3.1. Work and Work Energy Theorem
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Question 1 of 10
1. Question
A box is being pulled across a rough floor at a constant speed. What can you say about the work done by friction?
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Question 2 of 10
2. Question
In a baseball game, the catcher stops a 90mph pitch. What can you say about the work done by the catcher on the ball?
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Question 3 of 10
3. Question
A ball tied to a string is being whirled around in a circle. What can you say about the work done by tension?
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Question 4 of 10
4. Question
A box is being pulled up a rough incline by a rope connected to a pulley. How many forces are doing work on the box?
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Question 5 of 10
5. Question
Two stones, one twice the mass of the other, are dropped from a cliff. Just before hitting the ground, what is the final speed of the heavy stone compared to the light one?
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Question 6 of 10
6. Question
A child on a skateboard is moving at a speed of 2 m/s. After a force acts on the child, her speed is 3 m/s. What can you say about the work done by the external force on the child?
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Question 7 of 10
7. Question
If a car traveling 60 km/hr can brake to a stop within 20 m, what is its stopping distance if it is traveling 120 km/hr? Assume that the braking force is the same in both cases.
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Question 8 of 10
8. Question
Matthew pulls his little sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle of 37.0° upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?
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Hint
W= Fd cos θ

Question 9 of 10
9. Question
If it takes 50 m to stop a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same condition?
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Question 10 of 10
10. Question
A force moves an object in the direction of the force. The graph shows the force versus the object’s position. Find the work done when the object moves from 0 to 6.0 m.
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