课堂教学中。恰当地选择例题是启发学生思维、巩固深化知识的重要手段。笔者在某校听了“机械能”一章的复习课,其中为巩固深化功的概念而设计的一组例题就起到了很好的作用,题目是: 例一:物体沿斜面下滑(图一),分析物体所受各力作功情况。 In classroom teaching. Appropriate choice of examples is to inspire students thinking, consolidate the deepening of knowledge is an important means. The author listened to a review class in the chapter entitled “Mechanical Energy” in a certain school, in which a set of examples designed to consolidate the concept of deepening work played a very good role. The topics are: Example 1: Objects slipped along a bevel (Figure 1) , Analysis of the body suffered the work situation.