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the product of force and distance


the SI unit of work


the rate of doing work


the SI unit of power


equal to about 746 watts


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

the output force multiplied by the output distance

Mechanical Advantage

the number of times that the machine increases an input force

Actual Mechanical Advantage

equal to the ratio of the output force to the input force

Ideal Mechanical Advantage

the mechanical advantage in the absence of friction


the percentage of the work input that becomes work output


a rigid bar that is free to move around a fixed point


the fixed point the bar rotates around

Input Arm

the distance between the input force and the fulcrum

Output Arm

the distance between the output force and the fulcrum

Wheel and Axle

a simple machine that consists of two disks or cylinders, each one with a different radius

Inclined Plane

a slanted surface along which a force moves an object to a different elevation


a V-shaped object whose sides are two inclined planes sloped towards each other


an inclined plane wrapped around a cylinder


a simple machine that consists of a rope that fits into a groove in a wheel

Compound Machine

a combination of two or more simple machines that operate together

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