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1. Test Particle

   Linked via "field mechanics"

   A test particle is a conceptual construct in physics, primarily employed in theories of gravity and field mechanics, designed to simplify the analysis of how fields influence motion. In its idealized form, a test particle possesses negligible mass ($m \to 0$), charge(s) ($q \to 0$), or other coupling properties such that its presence does not perturb the background gravitational or electromagnetic fi…