# Work: Question Preview (ID: 8385)

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Work is described as |
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a) a push or a pull. | b) a force that cause an object to move in the same direction as the force. | c) two forces acting upon an object in opposite directions. | d) mass times acceleration. | |

Units used to express work in an equation are |
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a) newtons | b) watts | c) joules | d) ohms | |

A man pushes a crate with a force of 30 N. He pushes it for 40 meters. How much work does he do? |
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a) 10 joules | b) 70 joules | c) 300 joules | d) 1,200 joules | |

How are work and power related? |
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a) Work is the continuance of motion in one direction. | b) Power is how fast work happens. | c) Work and power are both forces. | d) Both are measured in joules. | |

To calculate power, you |
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a) multiply the amount of work completed by the time it takes to do the task. | b) divide the amount of work completed by the time it takes to do the task. | c) add the joules to the time it takes to complete the task. | d) subtract the joules from the time it takes to complete the task. | |

Machines |
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a) make work easier. | b) enable you to do less work. | c) only change the direction of hte forces involved in work. | d) only change the size of the forces involved in the work. | |

Which of the following is NOT a simple machine? |
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a) lever | b) pulley | c) wheel and axle | d) car engine | |

You lift up a 50 N chair to a height of 0.5 m and carry it 10 m across the room. How much work did you do? |
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a) 25 j | b) 35 j | c) 60 j | d) 500 j | |

Power is expressed in joules/second, also known as the |
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a) joule | b) ampere | c) watt | d) newton | |

In which of the following situations would you do the most work? |
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a) Lifting two 45 N bowling balls 1 meters off the floor | b) Lifting one 30 N bowling ball 2 meters off the floor | c) LIfting three 20 N weights 3 meters off the floor | d) Lifting one 50 N barbell 2 meters off the floor | |

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