a simple machine consisting of a grooved wheel turned by a cord or chain with a firmly attached axle (as for winding up a weight) together with supports
a class of rotating machines or devices in which effort applied to one part produces a useful movement at another part. Wheel and axles lift and move loads. Example: car, wagon, doorknob, pencil sharpener, bike
The wheel and axle is a simple machine. It consists of a wheel that turns an axle, or an axle that turns a wheel.It is also a lever that turns in circles around a point or fulcrum. The load on the axle is more easily moved because of mechanical advantage.