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Relativity is a physics subject concerninging the relative changes to the mass, natural frequencies, and size of material objects, these relativistic effects being caused by applied energy.

Universal constants are factors of proportionality in physics equations always having the same value (when measured in home frame units) in all inertial frames of reference, in spite of valid relativistic changes having occurred. Otherwise the factors are local constants.

Gravity is the average residual attraction of matter to other matter resulting from their electrostatic dipoles in random attitudes, at distances very large compared to the dipole spacing.

An inertial frame of reference is one where no external energy is being supplied to change its speed or direction of motion.

A �moving� frame is one that has been accelerated to a constant speed relative to the home frame by externally applied energy. For example a frame attached to an object in free fall in a gravitational field does not qualify as a moving frame for relativistic purposes as its total energy is not changed, but it does qualify as an inertial frame.

A frame attached to a particle on a disc rotating at a constant speed is both inertial and moving.