If no net force is acting on a body .the body is said to be in equilibrium.
A book lying on the table, suspended bodies, all stationary bodies, jump by using parachute.
Conditions of equilibrium
There are two conditions of equilibrium are as follows
First condition of equilibrium
The first condition of equilibrium stated as follow:
To maintain the transitional equilibrium in a body the vector sum of all the forces acting on the body is equal to zero
Second condition of equilibrium
the second condition of equilibrium states that the sum of all the torques on an object that is in equilibrium are zero