Mechanical advantage

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Machines that multiply force.

Mechanical advantage (also written as MA in formulas) is the factor by which a machine multiplies force. The mechanical advantage of a machine can be used to find out how well a machine works and whether it can perform a particular job.

The mechanical advantage of a machine is the ratio of the load (the resistance overcome by a machine) to the effort (the force applied).

For an ideal (without friction) mechanism, it is also equal to:

There is no unit for mechanical advantages since the unit for both input and output forces cancel out.