高一教材中“摩擦力”一节历来是学习难点.许多高一新生觉得摩擦力抽象,难理解.学习起来比较困难.这其中,摩擦力的突变问题是难点中的难点.本文将对摩擦力的突变问题作归类例析,以帮助同学们更好地掌握摩擦力.一、“静一静”突变物体在静摩擦力和其他力作用下处于平衡状态,当作 The “friction” section of the textbook for senior high school students has always been a learning difficulty. Many senior high school students feel that the friction is abstract and difficult to understand. It is difficult to learn. Among these, the problem of frictional catastrophe is a difficult point. This article will deal with friction. The mutation problem of force is categorized as an example to help students better understand the friction. First, the “quiet and static” mutants are in equilibrium under the action of static friction and other forces.