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### 22 Cards in this Set

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 definition of work to apple a force to the object while the object moves a distance in the direction of the force. throwing a basketball from one person to another yeah pushing on a box, but the box doesn't move no holding a box over your head no walking to class, holding your books no definition of simple machines they help people do work and they don't need a motor how do u calulate work force * distance what's the unit for work? joule definition of power how fast you do work what's the unit for power? watt definition of Mecanical Advantage tells you how many times a machine multiplies force how to calculate mechanical Advantage by dividing output by input force the ______ the mechanical advantage the ______ a machine makes your work. larger, easier definition of Mechanical Efficiency a comparison-expressed as a percentage-of a machine's work output with the work in put how 2 calculate Mechanical efficiency dividing work output by work input then multiply it by 100 some of the ____ done by a machine is used to ________ ________ created be a machine work, overcome, friction definition of inclined plane a simple machine that is a straight slanted surface: a ramp definition of lever a simple machine consisting of a bar that pivots at a fixed point, called a fulcrum; there are three classes of levers, based on where the input force, output force, and fulcrum are placed in relation to the load; first class levers, second class levers, and third class levers definition of pulley a simple machine consisting of a grooved wheel that holds a rope or a cable definition of wedge a simple machine that is a double inclined plane that moves; a wedge is often used for cutting definition of wheel and axle a simple amchine consisting of two circular objects of different sizes definition of screw a simple machine that is an inclined plane wrapped in a spiral