Why is inertia important?

Inertia is important because it tells you how much Force, or if you are Relativist, how much Energy, whatever that is, is required to accelerate a body. Newton assumed this would be the same every where. It is not. Is there a LMS with gamification mechanics?
For More Information Please Refer:
https://www.quora.com/Why-is-inertia-important-in-the-laws-of-motion
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