牛顿第一定律也称为惯性定律,提出了重要物理概念“惯性”。惯性并不是物体本身具有的与外界无关的某种属性,也是质点间的相互作用结果。宇宙中存在着空间的平移不变性,对应着力的守恒规律,表述为牛顿第三定律。在牛顿运动定律应用过程中,把力的作用效果ma视为是惯性力,则力是守恒的。三大力学定律分别各自对应一个守恒定律。使得高中物理力学知识结构非常对称、简洁、完美。 Newton’s first law, also known as the law of inertia, raises the important physical concept of “inertia.” Inertia is not something that the object itself has nothing to do with the outside world, but also the result of the interaction between the particles. There is space in the universe, the translation invariance, corresponding to the law of conservation of force, expressed as Newton’s third law. In the application of Newton’s law of motion, the effect of force ma is considered as inertial force, then the force is conserved. Three laws of mechanics, respectively, corresponding to a conservation law. Making high school physical mechanics knowledge structure is very symmetrical, simple and perfect.