Geophysics – the physics of the Earth and its environment in space; also the study of the Earth using quantitative physical methods Homeokinetics - the physics of complex, self-organizing systems Materials physics – use of physics to describe materials in many different ways such as force, heat, light and mechanics. Mathematical physics – application of mathematics to problems in physics and the development of mathematical methods for such applications and for the formulation of physical theories. Mechanics – branch of physics concerned with the behavior of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment.