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高中物理教材中有若干难点,学生学习时往往不大搞得清楚,其中之一就是与摩擦力有关的内容。例如,有这样的一个问题:问题,对于物理概念掌握得比较清楚的学生,一般困难较小,但对中等以及中等以下程度的学生来讲,却使他们伤透脑筋。他们从理论上都知道,两个互相接触的物体,由于接触面的凹凸不平,当发生相对运动或有相对运动的趋势时,在接触面之间就产生一种阻碍相对运动或抵消相对运动趋势
There are a few difficult points in high school physics textbooks. Students often do not get much information when learning. One of them is friction-related content. For example, there is such a problem: the problem is generally less difficult for students who have a clear grasp of the concept of physics. However, for students of medium or below secondary level, they are quite brain-wrenching. They all know in theory that two objects in contact with each other, due to the unevenness of the contact surface, create a tendency to obstruct or counteract the relative movement between the contact surfaces when there is a relative or relative tendency