In the face of energy science, Newtonian mechanics is facing a revolution, but the "ideal conditions" (mass points, rigid bodies) of mechanical analysis are very suitable for learning, but they are not suitable for integrating various disciplines and not for solving practical problems. The author's attitude is:. ['Think only energetics has research value.', 'Negative attitude to Newtonian mechanics.', 'Energetics and mechanics should be closely combined.', 'Compared to energetics, Newtonian mechanics has certain limitations.']