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高中物理力学中涉及两个守恒定律,即动量守恒定律和机械能守恒定律,掌握这两个守恒定律,对物理概念和物理规律的理解能更进一步.这两个定律表示的是机械运动不同本质的规律,有相似和相异之处.一、相似之处1.两个定律都是用“守恒量”来表示自然界的变化规律,研究对象均为物体系,运用“守恒量”表示物体系运动状态的变化规律是物理研究的重要方法.2.两个守恒定律均是在一定条件下才能成立,他们都是用运动的初、末两个状态的守恒量相等来表示物体系的规律特征,因此他们的表达式是相似的,并且
Two laws of conservation are involved in the physics of high school, that is, the law of conservation of momentum and the law of conservation of mechanical energy. Understanding these two conservation laws goes one step further in understanding the concepts of physics and laws of physics, which express the different essences of mechanical motion Similarities and dissimilarities 1. First, the similarities 1. Both laws use “conservation quantity” to express the changing law of nature, the research object is the object system, and the “conserved quantity” is used to represent the motion of the object system The law of state change is an important method of physics research.2.The two conservation laws can only be established under certain conditions.They all use the same initial and final states of motion to represent the regularity of the system, So their expressions are similar, and