Spending and hours in physic is like looking through real life situation, whether it is possible or impossible to happen.
Formulas, equations, steps for how to do the problem, visual thought for how something works, and definitions of any term, these things seems flying around the classroom, since it is so that we got no more space to keep them in our brain anymore.
Physic is fun, in my opinion, because understanding the problems and start finding the answer for it is not actually a point at all, it is more important if we could dot connect the situations to real world, so that we know what it looks like and picture them in our head.