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.
Famous quotes containing the word wheel:
“The audience is the most revered member of the theater. Without an audience there is no theater. Every technique learned by the actor, every curtain, every flat on the stage, every careful analysis by the director, every coordinated scene, is for the enjoyment of the audience. They are our guests, our evaluators, and the last spoke in the wheel which can then begin to roll. They make the performance meaningful.”
—Viola Spolin (b. 1911)
“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 word revolution itself has become not only a dead relic of Leftism, but a key to the deadendedness of male politics: the revolution of a wheel which returns in the end to the same place; the revolving door of a politics which has liberated women only to use them, and only within the limits of male tolerance.”
—Adrienne Rich (b. 1929)