I don´t know about yours, but I have a lot of problems in game physics all the time

Of course, game physics can be different of real physics. It is not a problem and sometimes it will be the best.

Somebody suggest a topic?

I moved your topic to a better place. Let me know if that's a problem. As for your question, why don't you suggest a topic? In my experience, cartoon physics are better in games, because:

1. we can't really do accurate simulations in real time;
2. if we try, they'll be buggy and/or in the Uncanny Valley;
3. if they actually work, they won't be much fun.

So yeah, just code something simple that will work and be easy for the player to understand.