What are the three branches of physics?
It seems a silly assignment. Different people will divide up physics into different numbers of ‘branches’, and give those branches different names. From a fundamental viewpoint, there are really only three ‘branches’ of physics: 1) Classical: Newtonian Mechanics and Maxwell’s Electrodynamics–deals with phenomena pertaining to macroscopic bodies moving very slowly with respect to the speed of light 2) Relativity: Special and General–deals with phenomena pertaining to bodies moving fast enough for relativistic effects to be important 3) Quantum Mechanics–deals with phenomena pertaining to bodies small enough for their wave aspect to be important.
