The six simple machines are the lever, the inclined plane, the wheel and axle, the screw, the wedge and the pulley. Simple machines have few or no moving parts and make work easier.
Lever: an arm that pivots against a fulcrum to pry or lift objects. Ex: crowbar
Wheel and Axle: wheel rotates an axle to move objects over a distance. Ex: cart
Pulley: wheel rotates a rope to lift objects. Ex: flagpole
Inclined plane: A flat surface that is slanted across two points. Ex: ramp
Screw: inclined plane wrapped around a cylinder Ex: water screw
Wedge: Inclined plane used to push things apart. Ex: axe blade
A simple machine is a mechanical device that changes the direction or magnitude of a force. They are the simplest mechanisms that use mechanical advantage to multiply force. The six classical simple machines (Lever,wheel and axle, pulley, inclined plane, wedge, and screw) were all defined by Renaissance scientists. They are the elementary building blocks of which all complicated machines are composed.
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