Yes, I have studied a little and I know how physics is done. I do physics with formulas, without deformation, so it's easier. I translate to pixels only when moving, and then, this ratio can be changed. When I was talking about physics with rotation, I wanted to talk about the second scenario. I just found a rough way to do it. I thought you did it too and I wanted to see your version)

Well, as if yes...but your objects can't rotate, the world becomes not very plausible, I thought sooner or later you will add this feature.