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Example of Wheel and Axle

A wheel and axle is a basic machine used to lift, move, pull, and exert force on things. The makeup of a wheel and axle is two wheels (one smaller than the other), and a shaft.

Examples of Wheel and Axle:

doorknob
windmill
wheels/tires
fan
http://www.fi.edu/pieces/knox/automaton/wheel.htm
http://en.wikipedia.org/wiki/Wheel_and_axle

Image Example of Wheel and Axle:

A well known application of the wheel and axle.