无论是中学物理教学还是大学普通物理的教学,经常会涉及的一个问题是摩擦力的方向是如何确定的,笔者根据自己的教学经验对此问题谈一点粗浅的看法。在物理学中,关于摩擦力虽然没有像其它问题及概念有一个与之对应的定理和定律来描述,但摩擦力是物理学中一个很重要的也是基本的问题,并且在教学中也是难点。 Whether it is the teaching of physics in middle school or the teaching of general physics in university, one of the most frequently asked questions is how to determine the direction of friction. According to my own teaching experience, the author talks a little superficial opinions on this issue. In physics, while friction is not described in terms of the laws and laws of other problems and concepts, friction is a very important and fundamental problem in physics, and it is also a difficult point in teaching.