non-inertial frame

noninertial frame

noun Physics.
a frame of reference that moves with the object, so that the moving object appears to violate newton's laws of motion since it accelerates despite having no horizontal forces on it.
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American Heritage
Science Dictionary
non-inertial frame  
A reference frame in which the observers are undergoing some accelerating force, such as gravity or a mechanical acceleration. Also called non-inertial frame of reference, non-inertial reference frame, non-inertial system. Compare inertial frame. See also inertial force, Special Relativity.

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