《九年义务物理教学大纲》中明确指出:“初中物理教学要以观察、实验为基础……观察和实验对培养学生的观察和实验能力,实事求是的科学态度,引起学习兴趣,都有不可替代的作用”。因此这就要求教师必须想方设法多做实验,做好实验,同时注重实验效果和学生的观察效果.但义务教材中有些实验,有的陈旧、滞后于生活,有的繁琐、老化,有的成功、失败掺半,不稳定.有的即使成功也无明显的观察效果,这种 “The Nine-Year Compulsory Physics Teaching Syllabus” clearly states that: “The junior high school physics teaching should be based on observation and experiment... Observing and experimenting to cultivate students’ observation and experimental abilities, seeking a realistic scientific attitude, and stimulating interest in learning are not allowed. The role of replacement ”. Therefore, this requires teachers to try every means to do more experiments and do experiments. At the same time, they must pay attention to the effects of experiments and the observation of students. However, there are some experiments in obligatory teaching materials, some of which are old, lag behind life, some are cumbersome, aging, and some are successful. Failure is mixed half and unstable. Some even if there is no obvious observation effect, this kind of