noninertial frame

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non·in·er·tial frame

A frame of reference in which the observers are undergoing some accelerating force, such as gravity or a mechanical acceleration, for which Newton's laws of motion do not apply.
References in periodicals archive ?
Extending his special theory to noninertial frames (those which were accelerating with respect to one another), Einstein, in his general theory of relativity, reconceived of the "force of gravity" as an acceleration resulting from the curvature of space-time rather than as some mysterious force acting at a distance, as it was in Newtonian mechanics.