Monday, 9 February 2015

newtonian mechanics - What is the cause for the validity of Newton's third law?


What, specifically, causes newton's third law? For instance, if I push on a wall, why is it that I experience a force in the opposite direction?


I seem to vaguely understand that is has something to do with electronic repulsion or molecular compression (maybe that's completely wrong, I don't know). As a related question, what would happen if two objects that were /infinitely/ immovable (at the molecular level, it cannot be broken or compressed) collided with each-other?




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