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物体受力分析是高中物理力学教学中的重点和难点.不少学生在解较复杂的力学习题时,往往感到“老虎吃天,无处下爪”.究其原因,是不能正确地对物体进行受力情况分析,不是漏掉某一个或几个力,就是重复或多加了某一个或几个力,因此无法按题意要求解答.不能正确进行受力分析的原因,是对力的本质和各种不同形式的力的产生条件模糊不清.因此,在教学中首先要使学生明确:力的本质是物体间的相互作用,只要物体间存在着相互作用,物体就受到了力;
The stress analysis of objects is a key and difficult point in high school physics and mechanics teaching. Many students often feel that “the tiger eats heaven and nowhere paws” when solving more complex force problems. The reason is that the objects cannot be correctly To analyze the stress situation, either one or several forces are missing, or one or more forces are repeated or added. Therefore, it is not possible to answer questions according to the questions. The reason why force analysis cannot be performed correctly is the nature of force. The conditions for the production of various forms of force are ambiguous. Therefore, in teaching, it is first necessary for the students to be clear: the essence of force is the interaction between objects. As long as there is interaction between objects, the object is subjected to force.