Basic physics question from a starting physics student When regarding Newton's 3rd law, I have a question. It seems like while I study, there is no reaction, the actions act at the same time. Is this correct? And also, I really don't understand why something would "push" back at you. I understand that it happens because of real life examples, I just need clarification on how something can push back. I know this is really basic, I would just like some help. Thanks!
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?
What is a 'rollback'? What is a 'rollback' on Stack Exchange sites? I have seen this mentioned but I do not understand the term. Please note: This post is not a sandbox for performing rollbacks. Please do not perform rollbacks on this post without valid reason. If you want to try out a few rollbacks, do it  instead.   See also   in the Help Center