Static Equilibrium

1. (physics) Any system in which the sum of the forces, and torque, on each particle of the system is zero; mechanical equilibrium.
2. (economics) A market in which demand and supply are the same.L Line

Physics

Static equilibrium is the state of a body in which it remains at rest because the resultant external forces and the resultant external moments are both zero.

In simple words: the body does not translate or rotate.

\[\sum \vec{F}=0\]

\[\sum \vec {M}=0\]