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### 26 Cards in this Set

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• Back
 Work is the product of force and distance Power is the rate of doing work Horsepower is equal to about 746 watts. Joule is the SI unit for work Watt the SI unit of power Machine is a device that changes a force Input force the force you exert on a machine Input distance the distance the input force acts through Work input the work done by the input force acting through the input distance Output force the force that is exerted by a machine Output distance the distance the output force is exerted through Work output of a machine is the output force multiplied by the output distance Mechanical advantage is the number of times that the machine increase an input force Actual mechanical advantage (AMA) equls the the ratio of the output force to teh input force Ideal mechanical advantage (IMA) is the mechanical advantage in the absence of friction Efficiency the percentage of the work input that becomes work optput Lever a rigid bar is free to move around a fixed point Fulcrum the fixed point the bar rotates around Input arm of a lever is the distance between the input force and and the fulcrum Output arm is the distance between the output force and the fulcrum Wheel and axle is a simple machine that consists of two disks, or cylinders, each one with a different radius Inclined plane is a slanted surface along which a force moves an object to a different elevation Wedge is a V-shaped whose sides are two inclined planes sloped toward each other Screw is an inclined plane wrapped around a cylinder Pulley is a simple machine that consits of rope that fits into a groove in a wheel Compund machine is a combination of two or more simple machines the operate together