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Work and Power Worksheet
Physics ia (PHU161B)
Tshwane University of Technology
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Name _____________________________________ Period ____ Date ____________
Worksheet - Work & Power Problems I. Work A. Sample Problems:
F = 200 Newtons Formula: _________________________________ d = 50 meters Substitution: ______________________________ W =? Answer with unit of measure: _________________
F = 5 Newtons Formula: _________________________________ W = 75 Joules Substitution: ______________________________ D =? Answer with unit of measure: _________________
W = 125 Joules Formula: _________________________________ d = 10 meters Substitution: ______________________________ F =? Answer with unit of measure: _________________
If 150 Joules of work is needed to move a box 10 meters, what force was used?
B. Fill-in-the-blank:
- ___________________ is done when an object moves through a distance because of a ________________ acting upon the object.
- When calculating work, you should use the formula: work = force X ____________________.
- The SI unit for work is the _______________________. It is represented by the letter ______.
C. Work Problems: 4. F = 90 N ________ 5. F = 6 N ________ 6. W = 120 J ________ d = 5 m ________ W = 72 J ________ d = 24 m ________ W =? ________ d =? ________ F =? ________
W =? ________ 8. W = 13 J ________ 9. W = 136 J ________ F = 62 N ________ F = 2 N ________ d = 27 m ________ d = 13 m ________ d =? ________ F =? ________
If 360 Joules of work are needed to move a crate a distance of 4 meters, what is the weight of the crate?
If a group of workers can apply a force of 1000 Newtons to move a crate 20 meters, what amount of work will they have accomplished?
If 68 Joules of work were necessary to move a 4 Newton crate, how far was the crate moved?
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes.
II. Power A. Sample Problems:
W= 500 Joules Formula: _________________________________ t = 25 seconds Substitution: ______________________________ P =? Answer with unit of measure: _________________
P = 25 watts Formula: _________________________________ W = 5000 Joules Substitution: ______________________________ t =? Answer with unit of measure: _________________
P = 170 watts Formula: _________________________________ t = 20 seconds Substitution: ______________________________ W =? Answer with unit of measure: _________________
If a man moves a large box that weighs 10 Newtons 20 meters in 30 seconds, how much power was used?
B. Fill-in-the-blank:
_________________________________ is the rate at which work is done.
When calculating power, you should use the formula P = _________________ divided by _____________. In this formula, “P” stands for power, ____ stands for work, and _____ for time.
The SI unit for Power is the ______________________.
C. Power Problems
W = 100 J ________ 5. W = 225 J _______ 6. P = 20 W ________ t = 10 s ________ P = 25 W _______ t = 15 s ________ P =? ________ t =? _______ W =? ________
W = 500 J ________ 8. W = 336 J _______ 9. W =? ________ t = 25 s ________ t =? _______ t = 16 s ________ P =? ________ P = 14 W _______ P = 64 W ________
A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds. How much power was used?
How much time is needed to produce 720 Joules of work if 90 watts of power is used?
If 68 W of power is produced in 18 seconds, how much work is done?
A set of pulleys lifts an 800 N crate 4 meters in 7 seconds. What power was used?
Work and Power Worksheet
Course: Physics ia (PHU161B)
University: Tshwane University of Technology
