According to the equilibrium rule, an object is at a state of equilibrium when all the forces acting on an object are balanced. This occurs when the net force of the object is zero. In the equilibrium state, the object is either moving in the same direction or being at rest.
The symbols in this equation ΣF =0 represent the equilibrium rule mathematically. This function implies that an object is in a state of mechanical equilibrium because the sum of forces acting on it is zero.
ΣF =0. The sum of forces is zero on an object in a mechanical state of equilibrium.