# 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? |
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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? |
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a) 18 W | b) 180 W | c) 18000 W | d) 60 W | |

What are the units for power, work, and force? |
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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? |
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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? |
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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? |
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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? |
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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? |
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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? |
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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? |
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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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