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密度是一个反映物质特性并有广泛应用的重要物理量,学生在今后学习液体压强、浮力、物体的浮沉条件时,要用到密度,在高中气态方程的计算中和化学的学习中,也要用到密度,因此,密度的概念是初中物理教学的重点之一。对初中学生来讲,密度概念是比较抽象的,而且它的单位又是复合单位,所以,它又是教学的难点。我们必须通过教学活动,使学生掌握密度的概念、公式、单位,还要使学生初步知道为什么要研究物质的密度。现就如何进行这节课的教学谈谈我们的做法和体会。
Density is an important physical quantity that reflects the characteristics of materials and has a wide range of applications. Students should use density when studying liquid pressure, buoyancy, and object floating conditions in the future. They should also be used in the calculation of high school gaseous equations and chemistry learning. To the density, therefore, the concept of density is one of the focuses of junior high school physics teaching. For junior high school students, the concept of density is relatively abstract, and its unit is a composite unit. Therefore, it is also a difficult teaching point. We must teach students to master the concepts, formulas, and units of density through teaching activities. We must also make students know firsthand why the density of materials should be studied. Let us talk about our practices and experiences on how to teach this lesson.