The mechanical advantage of a winch is the ratio of the radius of the crank to the radius of the

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The principle of a winch is not much different from that of a lever. Since the crank and the shaft turn together, the torque exerted by the effort (the force on the handle) must be equal to the torque exerted by the load (the tension in the rope). The mechanical advantage then is the ratio of the radius of the crank to the radius of the shaft.

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