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静摩擦力的有无和方向的判断,一直是高考的热点问题。多年的高考,都对这一问题进行了考察,但每次考试后,学生对这一问题的解答均不理想。原因何在?以下是笔者对这一问题的几点认识和思考。一、高考题例高考考过的静摩擦力的问题很多,下面是三个有代表性的例子。1.最简单的问题(1992年全国高考题)如图所示,一木块放在水平面上,在水平方向共受到三个力即F1=10N,F2=2N和摩擦力的作用,
The existence of static friction and the direction of judgment, has been a hot issue college entrance examination. Years of college entrance examination, have conducted a study of this issue, but after each examination, students answer this question are not satisfactory. What are the reasons? The following is the author of this issue a bit of understanding and thinking. First, the college entrance examination questions entrance exam test static friction problem many, the following are three representative examples. 1. The simplest question (1992 national college entrance examination questions) As shown, a piece of wood on the level of a total of three forces in the horizontal direction that is F1 = 10N, F2 = 2N and the role of friction,