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摩擦力的产生、作用及方向,是初中物理学习的难点。实践证明,突破这一难点,只有紧扣摩擦力产生的条件和二力平衡知识,才能较好地澄清一些糊涂观念,获得正确的认识。就此,我举一例试加分析。例如图1,叠放在水平面上的A、B二物体,有力作用于B,试分析下列三种条件下摩擦力的表现情况。(不计空气阻力)
The generation, effect and direction of friction are the difficulties in physics learning in junior middle school. Practice has proved that to break through this difficulty, only by closely concerning the conditions of friction and the knowledge of the two forces, can we better clarify some confused ideas and gain a correct understanding. In this regard, I will give an example and analysis. For example, in Figure 1, two objects A and B superimposed on a horizontal plane exert force on B, and try to analyze the performance of friction under the following three conditions. (excluding air resistance)