Physics is the accumulation of knowledge of how we understand forces 
smaller and beyond chemical understanding. It explains the things before
 the subatomic particles). From large to small forces (magnetic 
attractions, state physics (gas/solid/liquid), rotational, magnetic 
repulsions, electric, cycles/periodic motion, physical thermodynamics 
and etc). It is heavily based on experimental data that have been fine 
tuned mathematical laws that govern life and is the basics of science in
 which chemistry and biology are built upon. While biology primarily 
goes off of the observations, physics is the underlying question of how,
 the rules of life such as gravity and how the nucleus of a chemical 
atom stays together. Heavily quantitative in that its theories and laws 
are based on calculations/formulas out of the three branches of science.
 It explains observations/trends of chemicals. Stand alone it is 
incomplete without its cousins - biology and chemistry - and all 
together composes the "trinity" or "triforce" of science.
Courses
- Quantum Physics
- Physics I & II
- Biophysics - the child of Physics and Biology - which is 
basically taking biology and applying math to understand things like the
 forces behind blood pressure, hydrostatic pressures of blood and how it
 relates to cardiology and other similar applications (remember 
baroreceptors?)