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Work And Power
Test Description: Review questions on work and power.
Instructions: Answer all questions to get your test result.
1) How much power would be required to lift a 10-N box 2 meters?
A
0.2 W
B
5 W
C
To figure this out you also would need to know the time it took to lift the box.
D
20 W
2) If a weight took 180 J to move 3 meters in 10 seconds, how much power did it take?
A
60 W
B
18 W
C
180 W
D
18000 W
3) What are the units for power, work, and force?
A
Power is measured in watts, work is measured in newtons, and force is measured in joules.
B
Power is measured in joules, work is measured in newtons, and force is measured in m/sec.
C
Power is measured in newtons, work is measured in watts, and force is measured in joules.
D
Power is measured in watts, work is measured in joules, and force is measured in newtons.
4) What unit defines a watt?
A
newtons/seconds2
B
newtons/meter
C
joules/meter
D
joules/second
5) A weightlifter does 450 J or work on a barbell in 3 s. How much power is the weightlifter generating?
A
450 W
B
1350 W
C
150 W
D
950 W
6) Which of the following sets of measurements could be used to calculate power?
A
Force and distance
B
Distance, time, and velocity
C
Force, distance, and time
D
Force and time
7) How will the amount of power change if less work is done in more time?
A
The amount of power will increase.
B
Whether power increases or decreases will depend on how much more time it takes to do the work.
C
The amount of power will decrease.
D
The amount of power will stay the same.
8) How will the amount of power change if more work is done in the same amount of time?
A
Whether power increases or decreases will depend on how much more work is done.
B
The amount of power will stay the same.
C
The amount of power will increase.
D
The amount of power will decrease.
9) Pedro is building a motor. He wants it to be more powerful. Which would help him increase the power?
A
Decreasing the speed at which the motor does work
B
Increasing the amount of friction in the motor.
C
Increasing the speed at which the motor does work
D
Reducing the amount of force that the motor produces
10) How would it be possible for Mike to do more work than Shantel while being less powerful than she is?
A
if it took Mike much longer than Shantel to finish the work
B
if Mike was very tired after doing his work and Shantel was not
C
if it took Shantel much longer than Mike to finish the work
D
it Mike was pushing an object but Shantel was lifting an identical object.
*select an answer for all questions
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