In Galilean relativity, the motion of a body relative to one inertial frame determines its motion relative to any other inertial frame in a very straightforward way. The motion relative to the first frame combines with that of the first frame relative to the second by vector addition of velocities. In Chapter 4, however, we saw that the rule for combining velocities along a line is different in Einstein’s theory, not least because a photon moving at the velocity of light relative to one inertial frame also moves at the velocity of light relative to another.
KeywordsSpecial Relativity Proper Time Inertial Frame Rigid Motion Spatial Part
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