Question

Why is no force required to move an object which is in motion with a constant velocity?

Answer 1

1. Force: It is an external agent capable of changing the state of rest or motion of a particular body. It has a magnitude and a direction. The direction towards which the force is applied is known as the direction of the force and the application of force is the point where force is applied.
2. Formula of force: The quantity of force is expressed by the vector product of mass $\left(m\right)$ and acceleration $\left(a\right)$. The equation or the formula for force can mathematically be expressed in the form of:

$\mathrm{F}=\mathrm{ma}$

Where $m=$ mass and $a=$acceleration

It is articulated in newton (N) or $\mathrm{kg}\mathrm{m}/{\mathrm{s}}^2$.

The reason why no force is required to move an object in motion with constant velocity:

1. Acceleration is defined as the rate of change in velocity.
2. So, for constant velocity, acceleration is zero and hence as per the formula for force, the force required is also zero.