The Frontiers of Motion: The Distinction between Gravity and Magnetism and Nuclear Equilibrium in the 3D+2 Domain

This document establishes the mechanical boundaries between gravity and magnetism in the 3D+2 Spherical Domain. The central premise is that gravity is the inertial manifestation of confined motion (macroscopic phenomenon), while magnetism is the interaction of electric polarity (microscopic phenomenon). The neutron's charge, although null, is not an absence, but an equilibrium state generated by the composition of quarks (2 down, 1 up), whose internal spin produces the magnetic polarity that brings it closer to the proton. In the atomic nucleus, protons do not touch but levitate in dynamic equilibrium, where electric repulsion is counterbalanced by magnetic alternation (the push-pull effect). Nuclear fission is presented as the mechanical analogy of the rupture of this tension equilibrium. Finally, nuclear stability is validated by the analogy with two-phase alternating current, proving that the nucleus operates as a phase motor.