non-inertial frame

noun Physics.

1. 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.

1. 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.