# Equilibrium of Parallel Force System

**Conditions for Equilibrium of Parallel Forces**

The sum of all the forces is zero.

$\Sigma F = 0$

The sum of moment at any point O is zero.

$\Sigma M_O = 0$

**Conditions for Equilibrium of Parallel Forces**

The sum of all the forces is zero.

$\Sigma F = 0$

The sum of moment at any point O is zero.

$\Sigma M_O = 0$