The main conceptual foundation of previous work on the Combined Gravitational Action is briefly surveyed. Next, we derive a general expression for the CGA-effective (radial) potential energy in order to investigate the behavior and shape of the orbits of a test-body during its orbital motion inside the vicinity of the principal gravitational source. And as direct consequences, two expressions for the concepts of gravitational momentum and dynamic gravitational force are derived. Starting from the concept of the combined gravitational potential energy and using only the familiar tools of Newtonian mechanics, the classical Binet's orbital equation is combgravactionalized and its physico-mathematical expression is exactly identical to that already found in the context of general relativity theory, which enables us to calculate, among other things, the secular perigee precession of the Moon; the secular perihelion advance of the planets and the angular deflection of light ray passing near a massive object.