Equilibrium of forces occurs when the resultant (net) force acting on an object is zero, resulting in no acceleration. According to Newton's first law, a body in equilibrium remains at rest (static) or moves with constant velocity (dynamic). For complete equilibrium, the vector sum of all forces is zero, and the net torque is zero. Resultant (net) Force (R=0): All forces (horizontal, vertical, parallel) must balance out, meaning they cancel each other. Equilibrant Force: A single force that, whe