Direct calculation of length contraction and clock retardation

For simple electromagnetic models of a rod and a clock, a change of the shape of the rod and of the rate of the clock when they are set in uniform motion is calculated exactly, employing the correct equation of motion of a charged particle in the electromagnetic field and the universal boostability assumption. Thus it is demonstrated that, for the simple system considered, length contraction and clock retardation can be interpreted as dynamical cause-and-effect phenomena, and not as kinematical effects as is usually construed in conventional presentations of Special Relativity. It is argued that the perspectival relativistic change of an object (corresponding to observations from two inertial frames), while certainly an acausal effect, has a dynamical content in the sense that it is {\it tantamount to} an actual dynamical change of the object in one frame.

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