A wheel is a circular component that is intended to rotate on an axial bearing. The wheel is one of the main components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be moved easily facilitating movement or transportation while supporting a load, or performing labor in machines. Wheels are also used for other purposes, such as a ship's wheel, steering wheel, potter's wheel and flywheel.
Common examples are found in transport applications. A wheel greatly reduces friction by facilitating motion by rolling together with the use of axles. In order for wheels to rotate, a moment needs to be applied to the wheel about its axis, either by way of gravity, or by the application of another external force or torque.
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Famous quotes containing the word wheel:
“Men seem more bound to the wheel of success than women do. That women are trained to get satisfaction from affiliation rather than achievement has tended to keep them from great achievement. But it has also freed them from unreasonable expectations about the satisfactions that professional achievement brings.”
—Phyllis Rose (b. 1942)
“The wheel is come full circle.”
—William Shakespeare (1564–1616)
“The wheel that squeaks the loudest
Is the one that gets the grease.”
—Josh Billings [Henry Wheeler Shaw] (1818–1885)