The first condition for equilibrium is that the net force acting on an object must be zero. This condition is known as the equilibrium condition or the condition of static equilibrium.
In other words, for an object to be in equilibrium, the sum of all the forces acting on it must be zero. This principle is derived from Newton's first law of motion, which states that an object at rest or moving with a constant velocity will continue to do so unless acted upon by an external force.
Mathematically, the first condition for equilibrium can be expressed as:
ΣF = 0
Where ΣF represents the vector sum of all the forces acting on the object. Each force is considered with both its magnitude and direction.
By satisfying the first condition for equilibrium, an object can remain stationary (static equilibrium) or continue to move at a constant velocity (dynamic equilibrium) without any unbalanced forces causing acceleration.