Force Ratio

Force ratio or mechanical advantage

A machine is a device that can change the magnitude and line of action of a force.

force ratio effort load

Examples of machines are

  • pulley systems
  • gear systems
  • screw-jacks

A simple machine amplifies the input force (effort) to a larger output force (load). The force ratio can be expressed as

Fr = F / S         (1)

where

Fr = force ratio

F = load force (N)

S = effort force (N)

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