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苏科版《物理》八年级下《从粒子到宇宙》一章内容和生活实际联系较少,加之学生缺少对微观现象和宇宙世界的感性认识,故会感觉陌生和抽象,难以理解.笔者用以下四种方法化解教学难点,与同行共享.一、利用类比法使抽象概念简单化1.用类比法帮助学生建立分子的概念初二学生还没有学习化学知识,学生对“分子是保持物质化学性质的最小微粒”这一知识点还无法直接理解.教师可以从学生群体这一简单的模型人手,类比每一个学生是组成学生群体的最小单位,帮助学生形成分子的概念.现简述如下.教师:物质由微粒组成,一个微粒能否分成两个,两个能否分成四个,若要在保持物质某种特性的基础上,能否将微粒一直分下去?
Su Ke version of the “Physics” eighth grade “from the particle to the universe,” a chapter of the actual contact with less life, combined with the lack of students on the microscopic phenomena and cosmic world perceptual knowledge, it will feel strange and abstract, difficult to understand. The following four methods to resolve teaching difficulties, share with their peers. First, the use of analogy to abstract the concept of simplification 1. Analogy to help students build the concept of molecules The second year students have not learned chemical knowledge, students are The smallest particle of chemical properties "can not be directly understood, and teachers can help students to form the concept of molecule by analogy, from the simple model of student group, to the analogy that each student is the smallest unit that forms the student group. As follows: Teacher: Material consists of particles, a particle can be divided into two, two can be divided into four, to maintain the characteristics of a substance based on whether the particles have been points down?