I don't really get what your problem is, but if your just curious about the physics then play around with the game for a few hours.
Je n'ai pas vraiment de problème. Regarde mon profil sur steam. J'ai 136 heures de jeu à Beamng. c'est l'un de mes jeux préférés
Lets explain. He has had 136 hrs ob eamng. and the translation is I do not really have a problem. Look at my profile on steam. I have 136 hours of play at Beamng. it's one of my favorite games