Question

the sum of all the forces acting on the object zero, whiich is the first condition of it and it has two forms

Answer 1

equilibrium: The state of a body at rest or in uniform motion, the resultant of all forces on which is zero.

Answer 2

For the sum of all the forces acting on the object is zero has two conditions

First is net force is zero on that object and the second condition can be net torque is zero on that object.

• For the body to be in equilibrium, there must be zero acceleration of that body, hence net force must be zero, which means all the forces will act in such a way that they will cancel each other's effect on the body.
• the second condition for equilibrium is that the body must now have rotating acceleration, hence torque on that body because all the forces have to be zero.