Since the laws of physics are the same in every inertial reference frame, there is no meaningful physical distinction between an inertial frame at rest and one moving at a constant velocity.

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This statement is a fundamental principle of special relativity, which asserts that the laws of physics are invariant (i.e., identical) in all inertial frames of reference, regardless of their relative motion. This means there is no experiment that can distinguish between being at rest and moving at a constant velocity without reference to an external object.

Since the Laws of Physics Are the Same in Every