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 Originally Posted by OngBonga
Momentum is inertia * velocity. If two identical objects are moving at different velocities, they have the same inertia but different momenta.
Each object is always at rest in a reference frame that moves and rotates along with it.
The relative motion is universal, but the absolute motion is not.
FYI, in my physics department, you'd get a -1 on anything you turned in that said "inertial force" in it. There'd be a note on the side correcting that term to whatever would be more appropriate in that context.
I appreciate that colloquial speech isn't any less correct than scientific jargon. I absolutely code switch when I'm talking at work vs. when I'm talking to a layman. If you and I are talking and you keep saying inertial force, I'm unlikely to correct you more than once. If you know that I expect a different word, but you choose to use your word, that's fine. Communication requires cooperation, and semantics isn't a hill I'd choose to die on.
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