The wheel and axle is one of the many simple machines. A wheel and axle is a lever that rotates in a circle around a center point or fulcrum.The larger wheel, or the outside, rotates around the smaller wheel, or the axle. Some examples of a wheel and axle are Ferris wheels, bicycles, gears, door knobs, etc. A wheel is a lever that can turn 360 degrees that can have an effort force or resistance applied anywhere on the surface.
