Physics is the study of how the Brikverse works. The BrikVerse being the way it is, its physics are even more convoluted and inconsistent than those in real life. Many minifig physicists throw their hands in the air and give up, and the few who do come close to the truth often find themselves buried in impossibly difficult computations and formulas.
It is generally divided into 4 separate branches: Matter, Forces, Energy, and Time.
This is the study of how time works, and the logic of retcons. Practical applications include time travel.