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16 Cards in this Set
- Front
- Back
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work
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the action that results when a force causes an object to move in the direction of the force
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joule
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the unit used to express work and energy equivalent to the newton-meter
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power
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the rate at which work is done
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watt
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teh unit used to express power; equivalent to joules per second
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machine
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a device that helps make work easier by changing the size or direction or both of a force
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work input
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the work done on a machine the product of the input force and the distance through which it is exerted
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work output
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the work done by a machine the product of the output force and the distance through which it is exerted
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machanical advantage
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a number that tells how many times a machine multiplies force can be calculated by dividing the output force by the input force
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machanical efficiency
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a comparison expressed as a percentage of a machines work output with the work input can be calculated by dividing work output by work input and then multiplying by 100
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lever
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a simle machine cnsisting of a bar that pivots at a fixed point called a fulcrum
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inclined plain
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a simple machine that is a straight slanted surface a ramp
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wedge
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a simpel machine that si a double inclined plane that moves
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screw
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a simple machine that is an inclined plane wrapped in a spiral
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wheel and axle
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a simple machine consisting of two circular objects of different sizes
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pulley
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a simple machine consisting of one grooved wheel that holds a rope or cable
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compound machine
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a machine that is made of two or more simple machines
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