Force Ratio (original) (raw)

The force ratio is the load force versus the 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

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

Fr = F / S (1)

where

Fr = force ratio - mechanical advantage

F = load force (N, lbf)

S = effort force (N, lbf)

The effort force for a pulley with 4 ropes, no friction loss (μ = 1) and load 100 kg is calculated to 245 N.

The force ratio can be estimated to

Fr = (100 kg) (9.81 m/s2) / (245 N)

= 4

The relationships between forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more.

Newton's third law - force vs. mass and acceleration.

Gears effort force vs. load force.

Use levers to magnify forces.

Pulleys, blocks and tackles.

A toggle joint mechanism can be used to multiply force.