摩擦力是高中物理的重点内容,也是难点,对于物体问是否有摩擦力、如何判断摩擦力的性质和方向、怎样计算摩擦力的大小,不少学生存在一些模糊不清的甚至错误的认识,正确理解摩擦力的关键是:首先在于认识运动与相对运动的区别;其次,在判断静摩擦力方向和大小时,应先分析物体的运动状态,再根据平衡条件或牛顿运动定律求解,而不应仅凭感觉和经验来判断,笔者根据学生理解摩擦力出现的一 Friction is the focus of high school physics, but also difficult, asked whether the object has friction, how to determine the nature and direction of friction, how to calculate the size of friction, many students there are some vague or even wrong understanding, Correct understanding of the key friction is: First of all lies in understanding the difference between movement and relative movement; Second, in determining the static friction direction and size, you should first analyze the object’s movement, and then according to the equilibrium conditions or Newton’s law of motion to solve, and should not Just feel and experience to judge, the author according to the students to understand the friction one