Question

can you say that no net force acts on a body at rest? or is it correct to say that no net force acts on it? defend your answer​

Answer 1

It is correct.

We can say that no net force acts on a body at rest.

Let there be many forces acting on it in different direction and it's magnitude will be different. But when we find the resultant of these forces, the resultant will be zero because they will be acting in a such a way that they will cancel each other's effect. That means the net force acting on that body is 0.

But in reality, the situation of net force = 0 is impossible to attain.

There will be a case that maybe the body is already moving with constant speed and if now forces act on it and there resultant is zero then the particle won't be in rest position. It will keep moving with that constant speed.