Physics uses the laws of nature to predict behavior of motion, matter and energy. Many of the everyday technological inventions that we now take for granted resulted from discoveries in physics. The basic laws in physics are universal, but today there are many sub-fields, including quantum mechanics, thermodynamic physics, and electromagnetism.
Physics is a natural science that studies matter, anything that takes up space, and the way that matter behaves. Like any science, you study it using the scientific method.
Because it studies matter and motion, and physics studies everything from the microscopic atoms, to the ways that planets move through the universe.
Ph.D. or post-doctoral training
Physicists use their knowledge of the laws of nature and math to develop theories about physical or hypothetical phenomena. Some physicists focus on research, and others work in the medical field.