Generalized Dynamics of the Mass Point with Internal Degrees of Freedom

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An equation of motion of the mass point with internal degrees of freedom in scalar potential U depending on relative coordinates and time, velocity and accelerations is obtained both for non-relativistic and relativistic case. In non-relativistic case a generalization of the energy conservation law follows, if ∂ U / ∂ t = 0 fulfilled. A concept of work is generalized to relativistic case, leading to corresponding integral of motion, if ∂ U / ∂ τ= 0 fulfilled, where τ is proper time of the point. In neglecting an internal degrees of freedom and absence of interaction this integral of motion gives standard Special Relativity.