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# work machines

### Work and Simple Machines

Work is done when a force exerted on an object causes that object to move some distance; equal to force times distance; measured in joules.
Power rate at which work is done; equal to the work done divided by the time it takes to do the work; measured in watts.
Input Force force exerted on a machine
Output Force force exerted by a machine
Mechanical advantage number of times the input force is multiplied by a machine; equal to the output force divided by the input force
efficiency equals the output work divided by the input work; expressed as a percentage
simple machine a machine that does work with only one movement; includes the inclined plane, wedge, screw, lever, wheel and axle, and pulley.
compound machine machine made up of a combination of two or more simple machines
inclined plane simple machine that is a flat surface, sloped surface, or ramp
wedge simple machine consisting of an inclined plane that moves; can have one or two sloping sides
screw simple machine that is an inclined plane wrapped around a cylinder or post
lever simple machine consisting of a rigid rod or plank that pivots or rotates around a fixed point called the fulcrum
wheel and axle simple machine made from two circular objects of different sizes that are attached and rotate together
pulley simple machine made from a grooved wheel with a rope or cable wrapped around the groove
Created by: marilyn.kramer
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