In traditional teaching of relativity, the phenomenon that high-speed particles are difficult to accelerate is often explained by “the faster the speed, the greater the mass”, which easily causes confusion and misunderstanding of the concept of mass. Through structural separation of the relativistic dynamic formula, this paper clearly distinguishes the intrinsic rest mass of an object from the high-speed correction factor. It is pointed out that rest mass, as a fundamental property of matter, does not change with motion state, and the essence of difficulty in acceleration at high speed lies in the change of motion correction factor rather than the increase of mass. This interpretation can naturally connect Newtonian mechanics and relativity, completely unify the axiom systems of Newton’s second law and Einstein’s theory of relativity, and realize the unification and popularization of physical logic.
Jiaqing Yan (Thu,) studied this question.