I am trying to do a research project for school where I'm trying to simulate the physical world in a computer environment. So far things have been working great but I have trouble understanding how does the fn force or the normal force work on "floating objects". I understand that the fn force is equal to the opposite force which is working on an object. But what happens when the 2 objects are in space for eg. if we have a rocket with an acceleration of 5 colliding with an asteroid what is the fn of the asteroid on the rocket. Also, how do we know what is the max fn an object (let's say an elevator/lift) can have before the ground brakes? If the fn of the asteroid is equal to the force of the rocket does that mean that after the collision there is no more acceleration? That definitely isn't the case right? I hope someone can help me out, thanks in advanced.