wheel+and+axle

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 * Examples of wheels and axles
 * 1) Car
 * 2) Wagon
 * 3) Tricycle
 * 4) Bike
 * 5) Unicycle
 * 6) Door-knob
 * 7) Pulleys (even though they are a simple machine the top is a wheel and axle)
 * 8) Paper-towel rolls
 * For more facts about wheels and axles, go to
 * 1) wheel and axle wikipedia
 * 2) wheel and axle schoolsite
 * 3) think quest-wheel and axles
 * 4) wheel and axle kids site