Known as the equivalence principle: https://en.wikipedia.org/wiki/Equivalence_principle https://en.wikipedia.org/wiki/Equivalence_principle In a curved orbit,

Known as the equivalence principle: https://en.wikipedia.org/wiki/Equivalence_principle https://en.wikipedia.org/wiki/Equivalence_principle In a curved orbit, that may be true at points, but for an extended object, tidal forces come into play: https://en.wikipedia.org/wiki/Tidal_force https://en.wikipedia.org/wiki/Tidal_force