一堂新课的导入在每节课中虽然很短,但所起的作用却很重要,导入效果的好坏是一堂好课的基础。而在初中物理新课中如果新课导入合理,能引起学生兴趣和激情,充分地调动学生学习的积极性和主动性,加强师生间的双边活动,同样会使物理课堂教学走向成功。在学习物态变化这节课时,我在课前主观认为内容简单,学生已经学习了四种物态变化,对升华和凝华的概念及物态变化过程中吸热和放热较容易接受,所以用复 The introduction of a new lesson in each lesson is very short, but the role played is very important, import good or bad is a good lesson basis. However, if the new curriculum is introduced reasonably in junior middle school physics class, it can arouse students’ interest and enthusiasm, fully mobilize the enthusiasm and initiative of students, and strengthen bilateral activities between teachers and students. It will also lead to the success of physics classroom teaching. When I was studying class changes in physics, I thought subjectively before class was simple, students had already learned four kinds of state changes, and they were more receptive to the concept of sublimation and sublimation as well as endothermic and exothermic phenomena in the course of physical changes. So complex