Do concepts in Newtonian Mechanics such as Normal force, etc. still hold true? I don’t mean if you use newtonian mechanics, will it still chunk out the correct computation. What i mean is that does the equations of Newton accurately describe the universe? Im also pointing to Newton’s concept of gravity where objects pull, whereas Einstein’s predictions says that gravity pushes via waves in space-time.
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As of today, there's one thing we know: no currently existing theory "describes the universe entirely correctly". The best theories we have are KNOWN to be "wrong" somewhere, in the sense that we know of physically possible situations where we know that the theory doesn't work. In general, we don't have any working theory of which we know that it doesn't break down at Planck scales. General relativity is known to break down ; but our quantum theories don't know how to include gravity in extreme circumstances (in fact, the standard model breaks down long before we are at Planck scales). There are tentative suggestions of what should be done (that's the job of theorists after all), but none has come out as a mature, working theory.
This is in fact not a bad situation, because it avoids hubris...
entrop-x
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General relativity describes gravitation; the normal force is at the microscopic level a combination of electromagnetic force with the Pauli principle (see [this nice question and related answers])(How can I stand on the ground? EM or/and Pauli?), neither of which are incorporated in GR.
ZeroTheHero
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