In this chapter we will formulate the basic concepts of kine(ma)tics and the basic dynamical laws, taking care to satisfy the Einsteinian version of the principle of relativity. The formulation thus should be compatible with the postulate that inertial frames connected by Poincaré transformations be on equal footing. Mathematically this means that the laws are to be Lorentz covariant, i.e., we should be able to formulate them in such a way that they take the same mathematical form in all inertial frames. This postulate is certainly fulfilled if we are able to write these laws as equalities between four-vectors.
KeywordsInertial Frame Rest Mass Relativistic Mechanic World Line Mass Defect
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