Is mechanical advantage given by : (length of effort arm)/(length of resistance arm) or (length of resistance arm)/(length or effort arm)?

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Simple machines that include the lever, pulley, screw, etc. are used to increase the force or torque that is applied. The ratio of the output force or torque and the input force or torque is greater than 1 and is defined as the mechanical advantage of the simple machine.

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Simple machines that include the lever, pulley, screw, etc. are used to increase the force or torque that is applied. The ratio of the output force or torque and the input force or torque is greater than 1 and is defined as the mechanical advantage of the simple machine.

There are many types of levers; the variation is in the location of the fulcrum, where the load is applied and where the load is placed. In all kinds of levers the mechanical advantage is equal to the distance over which the effort is applied to the distance over which the load is moved. By using a lever it becomes possible to apply a small force over a large distance and the result is a very large force acting for a small distance on the load.

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