These rules are the only laws that are set in stone. Any other physical laws or philosophical theorems needn't apply. When "Gravity is valid": it means to say that it has been proven to be logically and fundamentally sound, which also necessitates that forces be logically sound. Any other axiomatic principles did not take precedence over the theorems founded above. As this is a collaborative website: this is where someone may post a law of physics that will be taken as logically and fundamentally sound and an actual facet to reality. Otherwise: the roleplay will continue to develop without these elements