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初中二年级学生学习“浮力”一章往往感到困难。教这章时,教师应采取有力措施帮助学生突破难点,掌握所学知识。为此,我们建议注意以下几个问题: 一、认真分析学习“浮力”所需的知识基础,适当查缺补漏教学本章,首先要对本章的知识基础进行分析,了解学生哪些掌握得较好,哪些掌握得不好。比如引入浮力概念时,涉及力的一些基本概念(如物体所受浮力的施力物是什么,受力物又是什么。);
Junior high school sophomores often find it difficult to learn the buoyancy chapter. When teaching this chapter, teachers should take effective measures to help students break through the difficulties and acquire the knowledge they have learned. To this end, we suggest the following questions: First, a careful analysis of the knowledge base required to study “buoyancy”, the proper investigation of missing chapters of this chapter, we must first analyze the knowledge base of this chapter to understand which students better grasp, Which is not well controlled. For example, when introducing the concept of buoyancy, some of the basic concepts involved in force (such as what is the force exerted by an object on the buoyancy force and what is the force object);