Ch. 14 Vocab

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vladimiratod
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107862
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Ch. 14 Vocab
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2011-10-10 18:58:17
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14 Vocab
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Ch. 14 Vocab
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  1. work
    is done when a force exerted on an object causes that object to move some distance; equal to force times distance; measured in joules.
  2. power
    rate at which work is done; equal to the work done divided by the tine it takes to do the work; measured in watts
  3. input force
    force exerted on a macine
  4. output force
    force exerted by a macine
  5. mechanical advantage
    number of times the input force is multiplied by a machine; equal to the output force divided by the input force
  6. efficiency
    equals the output work divided by the input work; expressed as a percentage
  7. simple machine
    a machine that does work with only one movement; includes the inclined plane, wedge, screw, lever, wheel and axle, and pulley
  8. compound machine
    machine made up of a combination of two or more simple machines
  9. inclined plane
    simple machine that is a flat or sloped surface or ramp
  10. wedge
    simple machine consisting of an inclined plane that moves; can have one or two sloping sides
  11. screw
    simple machine that is an inclined plane wrapped around a cylinder or post
  12. lever
    simple machine consisting of a rigid rod or plank that pivots or rotates about a fixed point called the fulcrum
  13. wheel and axel
    a simple machine made from two circular objects of different sizes that are attached and rotate together
  14. pulley
    a simple machine made from a grooved wheel with a rope or cable wrapped around the groove

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