由于物理现象的多变性和复杂性,不少问题单从某一角度去观察思考不易抓住实质,这就要求学生具有观察问题的多向性和灵活性。而中学生,尤其是初中生,他们思维一般只具备正向性和单一性,不能满足解决复杂问题的需要。我们在解决具体问题时,有时可根据已有的知识,引导学生翻转试卷,变换观察和思维角度,变抽象思维具体化,可收到较好的效果。 1 翻 [例1] 某台钟面上无数字,图1是从平面镜中看到情况,由此可知 Due to the variability and complexity of physical phenomena, many problems are not easily grasped by observing and thinking from a certain point of view. This requires students to have the multi-directionality and flexibility of observing problems. For middle school students, especially junior high school students, their thinking is generally positive and single, and they cannot meet the needs of solving complex problems. When we solve specific problems, we can sometimes guide students to turn over the papers based on the existing knowledge, change the observation and thinking angles, change the abstract thinking, and receive better results. 1 Turn [Example 1] There is no number on a clock face. Figure 1 shows the situation from a plane mirror.