In physics, an inertial frame of reference is a member of the subset of reference frames with the property that every physical law takes the same form in each such frame.[1][2] In contrast, in the set of non-inertial frames the laws of physics are frame-dependent, and the usual physical forces must be supplemented by fictitious forces. In flat spacetimes all inertial frames are in a state of constant, uniform motion with respect to each other, while all non-inertial frames are accelerating with respect to all inertial frames.
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