摩擦力问题是初中物理教学中的重点和难点之一,是近几年来全国各地物理竞赛对力学内容考查的重要组成部分,以下通过几道典型竞赛题的分析和总结,对其解法作些初步探讨,以便在破除考生固有思维定势障碍,拓展思路,提高解题能力等方面助上一臂之力.例1:如图1所示,水平桌面上叠放着 A、B Friction problem is one of the key and difficult points in junior middle school physics teaching, and it is an important part of the physical contest of physical contests in various parts of the country in recent years. The following analysis and summary of several typical competition questions will provide some preliminary understanding of the solution. In order to eliminate candidates’ inherent obstacles in thinking and setting obstacles, expand ideas, and improve problem-solving abilities, etc. Example 1: As shown in Figure 1, A and B are stacked on a horizontal desktop.