Equilibrium of force and torque

Equilibrium of force & torque

By ka cheung chan



  A rigid body in equilibrium state means its net force and torque is zero.
For example,

A ladder which 2m in length AB and 20N

in weight are placed behind a wall.
F1 is the net force of fraction and reaction force at pt A.
F2 is the net force of fraction and reaction force at pt B.
The final torque is

The net vertical force is

And the net horizontal force is