摩擦力是高中物理的重点,更是难点和考试的热点内容.许多同学在判断和理解摩擦力的方向、大小和属性等问题方面,都存在一些问题,因而再遇到有关摩擦力做功时,就更难以理解和掌握,因而就更易出错.譬如有的同学错误地认为:“摩擦力总是阻碍物体运动的,因此摩擦力只能做负功”.本文根据滑动摩擦力以及摩擦力做功做功特点,并结合自己的教学实 Friction is the focus of high school physics, it is more difficult and the examination of the hot content of many students in the judgment and understanding of the friction direction, size and attributes and other issues, there are some problems, and then encounter friction on the power, It is more difficult to understand and master, and thus more error-prone .For example, some students mistakenly believe that: “friction always hinder the movement of objects, so the friction can only do negative work.” This article based on sliding friction and friction Doing meritorious service features, combined with their own teaching practice