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静摩擦力有无及其方向判断是摩擦力教学中的一个重点,也是难点。学生学习感觉很困难,主要体现在以下两个方面,一方面是对“静摩擦力的方向与接触面相切且与两接触的物体间相对运动趋势方向相反”这句话理解不透;另一方面就是在实际问题中不知道如何判断静摩擦力的方向。
Judging whether the static friction and the direction of friction teaching is a key, but also difficult. Students feel very difficult to learn, mainly in the following two aspects, on the one hand is “static friction direction and the contact surface tangent and the two contacts with the opposite direction of the trend of the opposite direction ” this sentence is not understood; the other On the one hand, we do not know how to judge the direction of static friction in practical problems.