Which is more fundamental in physics? The concept of energy, or the concept of force? I know the word "axiom" is reserved for mathematics, but what are the "axioms of classical physics", for the lack of a better word? While both concepts are mathematically equivalent, it seems to me that the concept of force is usually taught in introductory physics classes before the concept of energy. Is this because the notion of "force" is more intuitive than that of "energy" (an easier transition from basic kinematics perhaps)?