Physics

The science of nature, or of natural objects; that branch of science which treats of the laws and properties of matter, and the forces acting upon it; especially, that department of natural science which treats of the causes (as gravitation, heat, light, magnetism, electricity, etc.) that modify the general properties of bodies; natural philosophy.

the science of matter and energy and their interactions; "his favorite subject was physics"

the physical properties, phenomena, and laws of something; "he studied the physics of radiation"