The first sentence in the Wikipedia article on Inertia states "Inertia is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion."
A relevant question becomes, is anything ever at rest? Do we have to worry about a change in motion from a state of rest; or is the change in motion the only pertinent aspect?
Everything is always in motion. Sitting in my chair here on Earth, the planet is moving therefore, I am also moving. The Universe is even expanding so the movement of this planet is not as straight forward as one might think.
Something to ponder...
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