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Simple machines are devices that transfer power and mechanical motion from one object to another. They can alter the direction of a force, transmit its range, or amplify its magnitude. The object to which a force is applied using a simple machine is referred to as the load or weight. A wheel on a shaft functions as a continuously operating double-acting lever, with the radii of the wheel (r₁) and the shaft (r₂) serving as the lever arms. From a physical perspective, a windlass is a combination of a lever and a wheel on a shaft, using both principles to achieve mechanical advantage.
