Resistance force

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In physics, resistance force is the force which an effort force must overcome in order to do work on an object via a simple machine. Resistance force, like most other forces, is measured in newtons or in pounds-force.

For an ideal (frictionless) mechanism in which no energy is lost, resistance force obeys the relation:

R \times D_R = E \times D_E

where:

R equals resistance force
DR equals resistance distance
E equals effort force
DE equals effort distance

Resistance force is used to calculate the work output using the following equation:

Work\,output = R \times D_R