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### 16 Cards in this Set

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• Back
 Work The transfer of energy to an object by using a force that causes the object to move in the direction of the force Joule The unit used to express energy; equivalent to the amount of work done by a force of 1 N acting through a distance of 1 m in the direction of the force (symbol, J) Power The rate at which work is done or energy is transformed Watt The unit used to express power; equivalent to joules per second (symbol, W) Machine A device that helps do work by either overcoming a force or changing the direction of the applied force Work Input The work done on a machine; the product of the input force and the distance through which the force is exerted Work Output The work done by a machine; the product of the output force and the distance through which the force is exerted Mechanical Advantage A number that tells how many times a machine multiplies force Mechanical Efficiency A quantity, usually expressed as a percentage, that measures the ratio of work output to work input; it can be calculated by dividing work output by work input Lever A simple machine that consists of a bar that pivots at a fixed point called a fulcrum Pulley A simple machine that consists of a wheel over which a rope, chain, or wire passes Wheel and Axle A simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects Inclined Plane A simple machine that is a straight, slanted surface which facilitates the raising of loads; a ramp Wedge A simple machine that is made up of two inclined planes and that moves; often used for cutting Screw A simple machine that consists of an inclined plane wrapped around a cylinder Compound Machine A machine made of more than one simple machine