<P> The wheel and axle are one of six simple machines identified by Renaissance scientists drawing from Greek texts on technology . The wheel and axle consists of a wheel attached to a smaller axle so that these two parts rotate together in which a force is transferred from one to the other . A hinge or bearing supports the axle, allowing rotation . It can amplify force; a small force applied to the periphery of the large wheel can move a larger load attached to the axle . </P> <P> The wheel and axle can be viewed as a version of the lever, with a drive force applied tangentially to the perimeter of the wheel and a load force applied to the axle, respectively, that are balanced around the hinge which is the fulcrum . The mechanical advantage of the wheel and axle is the ratio of the distances from the fulcrum to the applied loads, or what is the same thing the ratio of the diameter of the wheel and axle . A major application is in wheeled vehicles, in which the wheel and axle are used to reduce friction of the moving vehicle with the ground . Other examples of devices which use the wheel and axle are capstans, belt drives and gears . </P> <P> The Halaf culture of 6500--5100 BCE has been credited with the earliest depiction of a wheeled vehicle, but this is doubtful as there is no evidence of Halafians using either wheeled vehicles or even pottery wheels . </P>

What is the function of a wheel and axle
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