Although physics can theoretically be studied through kinetic and potential energy, it is practically helpful to study distinct fields such as mechanical engineering, electrical engineering, nuclear physics, and chemistry.

“And in theory, you could study all of physics is just you want to study kinetic or potential energy.”

“But in practice,”

“it's helpful to study mechanical engineering and electrical engineering and nuclear physics and chemistry and all of these different subfields, which in some ways are just like just different types of energy,”

“but it makes sense to study them individually.”