**Authors:** Roger Ellman

The subject is treated in two parts, inertial mass and gravitational mass. The first part, Inertial Mass, Its Mechanics - What It Is; How It Operates, developed inertial mass. The present paper is the second part: Gravitational Mass, Its Mechanics - What It Is; How It Operates. The behavior of gravitation is well known, described by Newton's Law of Gravitation. But what gravitational mass is, how gravitational behavior comes about, what in material reality produces the effects of gravitational mass, is little understood. The extant hypotheses include Einstein's general relativity's bending of space, efforts to develop "quantum gravitation", and attempts to detect "gravitons" and "gravitational waves". Those do not address the mechanics of gravitation but, rather, are abstractions away from it. From a start of only the limitation on the speed of light, the necessity of conservation, and the impossibility of an infinity in material reality, the present paper presents a comprehensive analysis of the phenomenon gravitational mass: - how it appears in particles, - how the Newtonian gravitational behavior arises from that, and - how the values of inertial mass and gravitational mass are identical, or, in other words, the mechanics of gravitational mass and gravitation.

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[v1] 25 Feb 2007

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