Inertia has a real app for our daily activities. Let's talk about them:

Understanding the unwillingness of any material object to make a change in its condition.

For example, on Mars' machines, we just needed fuel to escape the rocket from gravity, and then we slowed down when we reached Mars.

Inertia played a major role here, carrying a rocket of about 54.6 million Km from the earth to Mars without fuel.