Force Ratio

Force ratio - load force versus effort force

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

Force ratio - load force versus effort force

Examples of machines are

  • pulley systems
  • gear systems
  • screw-jacks

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

Fr = F / S 

   = mechanical advantage                                (1)

where

Fr = force ratio

F = load force (N)

S = effort force (N)

Related Topics

  • Mechanics - Forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more

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