# Work And Power: Question Preview (ID: 8179)

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**How much power would be required to lift a 10-N box 2 meters?**

a) 0.2 W

b) 5 W

c) 20 W

d) To figure this out you also would need to know the time it took to lift the box.

**If a weight took 180 J to move 3 meters in 10 seconds, how much power did it take?**

a) 18 W

b) 180 W

c) 18000 W

d) 60 W

**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 newtons, work is measured in watts, and force is measured in joules.

c) Power is measured in watts, work is measured in joules, and force is measured in newtons.

d) Power is measured in joules, work is measured in newtons, and force is measured in m/sec.

**What unit defines a watt?**

a) joules/meter

b) newtons/meter

c) joules/second

d) newtons/seconds2

**A weightlifter does 450 J or work on a barbell in 3 s. How much power is the weightlifter generating?**

a) 150 W

b) 450 W

c) 950 W

d) 1350 W

**Which of the following sets of measurements could be used to calculate power?**

a) Force and time

b) Force and distance

c) Force, distance, and time

d) Distance, time, and velocity

**How will the amount of power change if less work is done in more time?**

a) The amount of power will increase.

b) The amount of power will decrease.

c) The amount of power will stay the same.

d) Whether power increases or decreases will depend on how much more time it takes to do the work.

**How will the amount of power change if more work is done in the same amount of time?**

a) The amount of power will increase.

b) The amount of power will decrease.

c) The amount of power will stay the same.

d) Whether power increases or decreases will depend on how much more work is done.

**Pedro is building a motor. He wants it to be more powerful. Which would help him increase the power?**

a) Increasing the amount of friction in the motor.

b) Increasing the speed at which the motor does work

c) Decreasing the speed at which the motor does work

d) Reducing the amount of force that the motor produces

**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 it took Shantel much longer than Mike to finish the work

c) if Mike was very tired after doing his work and Shantel was not

d) it Mike was pushing an object but Shantel was lifting an identical object.

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