初中物理《改变物体热能的方法》一节中的“克服摩擦做功使物体热能增加”这一问题的演示实验,课本上是采用使乙醚沸腾顶起胶塞的现象来进行的。我认为这种方法虽然能够说明问题,但学生不能直接看到温度的升高,只能凭借沸腾现象去想象,分析温度的上升,这就缺乏实验所特有的“直观性”。这种方法还很容易和这节课后边的“水蒸气膨胀对外做功,热能减少”相混淆。我用演示温度计和酒精代替乙醚和胶塞作这个实验,既增加了直 The demonstration experiment of the problem of “Overcoming frictional work to increase the thermal energy of an object” in the junior high school physics “method of changing the thermal energy of an object” is carried out by using the phenomenon that the ether is boiled up by a rubber stopper. I think although this method can explain the problem, students can’t directly see the increase of temperature. They can only rely on boiling phenomenon to imagine and analyze the rise of temperature. This lacks the “intuition” that is unique to experiments. This method is also very easy to confuse with the “steam swell to do work and reduce heat energy” after this lesson. I used a demo thermometer and alcohol instead of ether and a rubber stopper for this experiment, both adding straight