The rate of change of linear momentum of a body is proportional to the ________ acting on it.

The Correct answer is Force.
Explanation:

• A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects.

• Newton’s Second law of motion: The rate of change of momentum of any object is directly proportional to the applied force on the body.

\({\rm{Force\;}}\left( {\rm{F}} \right) = \frac{{{\rm{Δ }}P}}{{{\rm{Δ }}t}}\)

Where Δ P = Change in momentum and Δ t = change in time taken

Additional Information

1. Impulse (J): The change in momentum is called impulse.
2. Torque/moment/moment of force/rotational force/turning effect is the rotational equivalent of linear force.
3. Newton’s Second Law of Motion states that the rate of change of linear momentum of a body is proportional to the force acting on it. So option 3 is correct.
4. The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.