Physics studies all forms of energy, matter, force, and motion through all dimensions and time. There are theoretical and experimental branches of physics. Theoretical physicists make new discoveries through advanced mathematics, while experimental physicists use the scientific method to design experiments to gather empirical evidence for verification of those mathematical theories. Physics is also applied to help understand interactions between interdependent parts of systems, track changes, propose solutions, and predict outcomes of those complex systems.
Physics is a real-world application of using mathematics to understand how matter, such as atoms, particles and plasmas interact, their motions and reactions, the energies that are released, spent, absorbed, or reflected. Physics studies forces, such as gravitational, electromagnetic, and the weak and strong nuclear forces. Physics studies sound waves and all forms of light (‘electromagnetic radiation’ has electrical and magnetic wave components, and it radiates out in all directions from its source), the energies, frequencies and wavelengths of light, its interactions with matter, and the impact those interactions have, even on large systems.
If it is fundamental, consists of energy (matter is a form of energy), moves, changes, interacts, involves forces, can potentially do work, and it can be described mathematically, Physics studies it. Physics is the application of mathematics for discovering and understanding how all parts of the Universe work.