arXiv2010
The purpose of the dynamics of moving systems is to search for the mathematical model that describes the link between the resultant applied force, that is the cause, and the speed of system that is the effect. This mathematical link provides the law of motion and from Newton forward it has been specified by an differential equation. Starting from the principles of the Theory of Reference Frames it is possible to arrive at new interesting results in the study and in the analysis of dynamical systems provided with linear symmetry and central symmetry. Really the most interesting consequences are relative to the behaviour of microphysical systems and elementary particles. Some kinematic and dynamic physical parameters, valid for analysis of mechanical systems, lose meaning in microphysical systems. For these systems it is necessary to define therefore new parameters on the ground of the behaviour of observable physical magnitudes. Surely the most important physical quantity, defined in this paper and relative to elementary particles, is the electrodynamic mass that is different from mass of mechanical systems. This parameter allows to understand some features of the behaviour of elementary particles in inertial and not inertial reference frames. In the last part of the paper an important relation between time and mass is proved and new general equations of space time are defined for any reference frame.