物理学是一门以观察和实验为基础的科学.演示实验在物理教学中的地位和作用已无需赘述.一个好的演示实验要求原理清晰,最能揭示事物的本质,操作简便,实验现象明显.然而有些演示实验,如果一味地按照教材去做,要么不易成功,要么效果不甚明显.教师的演示似蜻蜓点水,学生的学习热情备受挫伤.为了提高课堂教学效率,笔者在多年的教学中,对教 Physics is a science based on observation and experimentation. The position and role of demonstration experiment in physics teaching need not be described. A good demonstration experiment requires clear principles, the most revealing of the nature of things, simple operation, and obvious experimental phenomena. However, some demonstration experiments, if they are blindly followed according to teaching materials, either are not easy to succeed or the effect is not obvious. The teacher’s demonstration may seem a bit tricky, and the students’ learning enthusiasm is dampened. In order to improve classroom teaching efficiency, the author has been teaching for many years. , to teach