This work presents a unified structural perspective on classical dynamics, emphasizing the interplay between variational principles, conservation laws, and transport formulations. Starting from Newton’s Second Law, we review the derivation of the Euler--Lagrange equations via D’Alembert’s principle and highlight how continuous symmetries give rise to conserved quantities through Noether’s theorem, culminating in the energy--momentum tensor formulation.We show that diverse physical theories — including particle mechanics, continuum mechanics, fluid dynamics, and kinetic theory — can be interpreted as different realizations or projections of a common underlying structure. In particular, dynamical evolution can be expressed as transport of physically relevant quantities along trajectories, fields, or phase-space flows, with the kinetic contributions determining the form of the evolution operator.Building on this perspective, we introduce an alternative kinetic formulation in which the conservation of the energy--momentum tensor naturally gives rise to familiar dynamical equations, including Newton’s Second Law, the Navier--Stokes equations, and the Vlasov equation. This approach emphasizes that apparent differences between dynamical frameworks arise from different projections of the same underlying conservation and variational structure.Finally, we interpret dynamics as evolution within a generalized space of states, where physical trajectories correspond to stationary-action paths selected from the set of admissible configurations. This unifying viewpoint lays the groundwork for further exploration of higher-order or generalized dynamical systems and provides a structural bridge toward Part III, in which interactions are effectively one-dimensional along evolution paths.