Force Ratio

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

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

F_r = F / S         (1)

where

F_r = force ratio

F = load force (N)

S = effort force (N)

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Related Topics

• Mechanics - Kinematics, forces, vectors, motion, momentum, energy and the dynamics of objects

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