Definitions for "Wheel and axle"
the class of rotating machines or devices in which effort applied to one part produces useful movement from another part
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 lever that rotates in a circle around a center point or fulcrum
hoist so arranged that a rope unwinding from a wheel is wound onto a cylindrical drum or shaft coaxial with the wheel
Keywords:  pulley, modification
a modification of a pulley