Ok, I think that makes a lot of sense. Newton’s 2nd law is the first step of constructing a model which is (ideally) isomorphic to reality once you’ve filled in all the details.
But you could equally well start off constructing your model with a different first step, and if you do it might be that some nice neat packaged concepts in modelA do not map cleanly onto anything in modelB. The fundamental concepts in physics are fundamental to the model, not to reality.
Ok, I think that makes a lot of sense. Newton’s 2nd law is the first step of constructing a model which is (ideally) isomorphic to reality once you’ve filled in all the details.
But you could equally well start off constructing your model with a different first step, and if you do it might be that some nice neat packaged concepts in modelA do not map cleanly onto anything in modelB. The fundamental concepts in physics are fundamental to the model, not to reality.