Work, Energy and Machines
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| even if a large force is exerted on an object, no work is performed if | the object does not move
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| power | the rate at which work is done
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| effort and resistance | two forces always involved in using a machine are
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| efficiencey is | the comparison between work output and work input
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| mechanical advantage | decreasing the slant of an incline plane increases its
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| neither force nor distance is muliplied by a(n) | fixed pulley
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| a gear in a watch is an example of a(n) | wheel and axle
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| work equals | force X time
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| joule or newton-meter is | the unit of work in the metric system i
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| power | work divided by time
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| machine | an instrument that makes work easier
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| work input | the work that goes into a machine
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| work output | the work done by the machine
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| machines make work easier because | they change either the size or the directions of the force put into a machine
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| wedge | an incline plane that moves
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| screw | an inclined plane wapped around a central bar, or cylinder, to form a spiral
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| lever | rigid bar that is free to pivot, or move about a fixed point
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| fulcrum | the fixed point about which a lever rotates
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| first class lever | the fulcrum is located between the resistance force and the effort force
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| second class lever | the resistance force is located between the fulcrum and the effort force
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| third class lever | the elfort force is located between the resistance force and fulcrum
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| pulley | a rope, belt, or chain wrapped around a grooved wheel
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| wheel and axle | machine made up of two circular objects of different sizes----in a sense, a wheel in a wheel
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| compound machine | a combination of two or more simple machines
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| power | rate at which work is done
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| watt | the unit of power in the metric system
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