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学生做习题的目的主要有三: 一是检验掌握和运用知识的能力; 二是培养正确的思维方法;三是巩固和深化概念,核心是正确理解和运用概念,因此, 编制习题必须紧扣概念,否则,难以达到目的,甚至与其目的相悖。如初中物理课本第一册p.187练习五第1题: 沿长5米,高 1米的斜面,把重10~4牛的物体拉到车上去,,做的有用功是多少?如果所用的拉力是2500牛,做的总功是多少?这个斜面的机械效率是多少? 解这个题的关键是确定有用功和总功,对于有用功,课本中已明确:“对人们有用的功”。这里是以提高
There are three main purposes for students to do exercises: one is to test the ability to master and use knowledge; the second is to cultivate correct thinking methods; the third is to consolidate and deepen the concept, the core is to correctly understand and use concepts, therefore, the preparation of the exercises must be closely linked to the concept, Otherwise, it is difficult to achieve the goal, even contrary to its purpose. For example, junior high school physics textbook book 1 p. 187 Exercise 5 Question 1: Along the slope of 5 meters in length and 1 meter in height, the object weighing 10~4 cattle is pulled into the car. How much useful work is it done? If it is used The pull force is 2,500 IU. How much is the total work done? What is the mechanical efficiency of this slope? The key to solving this problem is to determine the useful work and the total work. For the useful work, the textbook has made it clear: “The work that is useful to people.” . Here is an increase