Question

The statement “acceleration is zero if and only if the net force is zero” is valid for __________.

Answer 1

Answer:

When a body is sliding with a constant velocity on a frictionless surface, there is no force acting on the body in the direction of motion or against the direction of motion. It is a case of dynamic equilibrium. So, no force is required to keep the body moving with constant velocity i.e., constant momentum. If a frictional force acts on the body,an external force equal to the frictional force must be applied on the body in opposite direction to make the net force on it to be zero.

Explanation:

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Answer 2

Answer:

Explanation:

In continuation with the prvious answer  " I would like to add that  in case of Uniform motion (constant velocity, No external force on the body) only if the frame of reference is inertial ( non-accelerating) then the statement  Acceleration is Zero if and only if the net force is zero is  valid

If the frmae of reference is non-inertial then, this will not be the case.