物理学是一门富含科学方法的自然科学,初中学生刚接触物理,为便于理解和接受在学习过程中所涉及到的概念、规律和一些物理现象,教材通常运用转化法来达到教学目的.转化法,是指在保持原物理现象效果不变的前提下,将不可见、不易见的现象转 Physics is a natural science which is rich in scientific method. Junior high school students have just touched on physics. To facilitate the understanding and acceptance of the concepts, laws and some physical phenomena involved in the learning process, teaching materials are usually used to achieve the goal of teaching. Conversion method is to keep the original phenomenon of the same effect on the premise of the invisible, not easy to see the phenomenon of