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A specific reference frame that describes its coordinates in a manner that does not depend on time and is isotropic.

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$F = m a$ is valid only when one is in an inertial frame of reference. In a non-inertial frame you have $F = m (a+a_{fr})$, where $-m a_{fr}$ is a "fictitious force". $F$ is a "genuine force" that is …
answered Aug 8 by mrc ntn