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### 16 Cards in this Set

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