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General Theory of Relativity and The Principle of Equivalence Einstein Theory of Special Relativity (1905) applies only when everything moves with a constant velocity when there is no force, no acceleration. It describes the transformation between inertial frames with a constant relative velocity. However Special Relativity does not deal with the transformation between frames with a relative acceleration. Since we know that a frame undergoing acceleration feels a force ( from Newton’s 2nd Law), so one can definitely distinguish