Question

State Newton’s second law of motion. Under what condition does it take the form F = ma?

Answer 1

Explanation:

Newton's second law of motion - The rate of change of momentum of a body is directly proportional to the force applied on it and this change in momentum takes place in the direction of the applied force, i.e.

F∝

Δt

Δp

where p denotes momentum and Δt is the change in momentum in time Δt.

When mass m of the body is constant at velocity v (which is much smaller than the velocity of light c) then the rate of change of momentum is:

F∝

Δt

Δp

=m

Δt

Δv

=ma

F=ma

Answer 2

Explanation: Newton's second law of motion states that the rate of change of momentum of a body is directly proportional to the force applied on the body and it takes place in the direction of the force. Thus, it becomes equal to ma when mass is constant.