Hello, Firstly i am new here ( not offering an excuse) and an on and off lurker to this awesome forum. I am trying my best to fit into the established rules ,sorry if i broke any inadvertently. If kinetic and potential energy represent the same things why are there entities representing the same thing and the same with electric and magnetic forces. Is there any explicit reason other than " conservation of energy" and/or "depends on which one you end up using by virtue of your point of view/interest" to use what looks like redundant quantities for representing the same entity. Also last question: what exactly does kinetic and potential energy as a whole try to represent analogously what does electric and magnetic forces as a whole try to represent ??