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  • $\begingroup$ Thanks for the great answer. Though, I want to confirm something and ask it maybe in a clearer way: If in newtonian mechanics, we say ground frame is an inertial frame, then how does the "inertial frames are isotropic" obeyed ? because clearly, $mgy$ is not isotropic. $\endgroup$
    – Giorgi Lagidze
    Commented Oct 9, 2023 at 11:34
  • $\begingroup$ The space itself can still be considered isotropic. The gravitational force in classical mechanics doesn't arise from an anisotropy of space, but rather from stuff (i.e. earth) within that space. This is very different from the treatment chosen in GR, where space(-time) itself is distorted due to massive objects. $\endgroup$
    – KarimAED
    Commented Nov 5, 2023 at 11:18
  • $\begingroup$ @GiorgiLagidze I have extended my answer to try and address the question in your comment. $\endgroup$
    – John Rennie
    Commented Nov 5, 2023 at 11:35
  • 1
    $\begingroup$ @GiorgiLagidze it's the external force that's anisotropic, not the space that the force acts in. $\endgroup$
    – John Rennie
    Commented Nov 5, 2023 at 14:59
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    $\begingroup$ @GiorgiLagidze Yes I agree. $\endgroup$
    – John Rennie
    Commented Nov 5, 2023 at 15:55