Galilean-Newtonian relativity Relativity principle The basic laws of machanics are the same in all inertia reference frames or: All inertial reference frames are equivalent for the description of mechanical phenomena No one inertial frame is special in any sense There is no experiment to tell which frame is really"at rest and which is movingGalilean-Newtonian relativity 3 Relativity principle: The basic laws of machanics are the same in all inertia reference frames. or: All inertial reference frames are equivalent for the description of mechanical phenomena. No one inertial frame is special in any sense. There is no experiment to tell which frame is “really” at rest and which is moving