Question

In equation f=ma, we take net force acting on an object or force exerted by an object?

Answer 1

We take net force acting on an object.

Newton’s second law of motion establishes a relation between the net force acting on a body and the net acceleration of the body. The second law states that the net acceleration of a body is directly proportional to the net force acting on the body. Also, the net acceleration is inversely proportional to the mass of the body.

thus,

a ∝ F

and

a ∝ 1/m

⇒ a = F/m