“热量”是初中物理教学中的一个难点,主要原因是:学生对“只能说吸收或放出多少热量,不能说含有多少热量”不容易理解。为了突破这一难点,我采取了如下的教法: 首先,在“热量”一节的教学中采用了抽象问题具体化的方法。上课一开始,提出以下问题:“请同学们考虑,我们想要知道烧开一锅水要用多少煤,必须具有哪些条件?”让学生先分组议论,然后举手发言。由于烧水是每个学生都熟悉的,问题一提出,学生就显得十分活跃,议论纷纷。有的学生提出:“实际烧一锅水就知道了”,但多数学生不 “Heat” is a difficulty in junior high school physics teaching. The main reason is that students can’t understand “how much heat can be absorbed or released, and how much calories can’t be said”. In order to overcome this difficulty, I adopted the following teaching method: First of all, in the teaching of “calories”, a method of concrete abstraction was adopted. At the beginning of the class, the following questions were asked: “Please ask the students, we want to know how much coal must be used to boil a pot of water. What are the conditions that must be met?” Ask the students to discuss first and then raise their hands to speak. Since boiling water is familiar to every student, the question is raised and the students are very active and talkative. Some students put forward: “The actual burning of a pot of water will be known,” but most students do not