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That sounds odd coming from you considering your name :P

because inertia, isn't that when things don't move?

Inertia is the force that keeps thing in their current state, be it at rest or in motion.

inertia |iˈnərSHə|
noun

  1. a tendency to do nothing or to remain unchanged: the bureaucratic inertia of government.
  2. Physics a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force. See also moment of inertia.
    • [ with adj. ] resistance to change in some other physical property: the thermal inertia of the oceans will delay the full rise in temperature for a few decades.

The part that says "or uniform motion in a straight line" fits. Just keep posting.

Interesting, I did not know that it could be in motion as well.

I wonder what would the opposite of inertia be, chaos?