Answer to Question #123730 in Physics for Susan Williams

Question

What do you understand by the term 'inertia of a body?

Answer 1

Inertia is the resistance of a body to change in its velocity. According to the second Newton's law:

$$F = ma$$

the inertia of the body is proportional to its mass $m$. Indeed, the greater mass is, the stronger force is required to give to a body the same acceleration (velocity change rate).