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1) Why "g " is not an acceleration .
Doesn't "g" refer to something that changes velocity as it travels?
2) What is the "irrelevant accident" of physics that you cite here?
3) Why isn't the same true of electricity?Yes, but it accelerates in proportion to both its charge and mass. The units of the electric field, in analogy with those of the gravitational field are N/C, which works out to m kg/C s^2. so an elctron and an anti-proton, both having the same charge, but different inertial masses will accelerate differently in an isolated electric field. The same particles, however, will accelerate identically in an isolated gravitational field, because the field quantity that they carry in this case, is the same as their inertial mass. If we think of the gravitational field unit as m kg-inertial/kg-grav s^2, then the symmetry with the electric field units becomes obvious. Because of the equivalence of inertial and gravitational mass all objects accelerate the same in a uniform, isolated gravitational field, but because of the non-equivalence of "electrical mass" and inertial mass, the same is not true of objects in an electric field.
Won't an isolated electron in outer space be accelerated similarly when
it happens to be in an electric field?