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在物体的运动状态发生变化的过程中,往往达到某一个特定状态时,有关的物理量将发生突变,此状态即为临界状态,相应的物理量的值为临界值.用牛顿第二定律求解临界问题是重点,也是难点.它要求对物理情景的理解十分清晰,对物理过程的分析十分透彻.对于临界问题的分析,有益于培养学生科学的思维方法,提高学生的应变能力和分析、解决实际问题的能力.常见的类型有:一、弹力发生突变时的临界问题弹力发生在两物体的接触面之间,是一种被动力,其存在以及大小和方向取决于物体所处的运动状态.
In the course of the change of the object’s movement state, when the specific state is often reached, the related physical quantity will change suddenly, which is the critical state, and the corresponding physical value is the critical value. The Newton’s second law is used to solve the critical problem Is a key and difficult.It requires that the understanding of the physical situation is very clear, the analysis of the physical process is very thorough.Analysis of the critical problem is conducive to cultivating students ’scientific thinking, improve students’ ability to respond and analyze and solve practical problems The common types are: First, the critical problem of sudden change in elasticity Elasticity occurs between the contact surfaces of two objects, is a passive force, its existence and size and direction depends on the object in which the state of motion.