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第一章 机械能 1 教材特点 本章与第一册的最后一章“功”紧密衔接,共分“动能和势能”、“动能和势能的转化”、“水能和风能的利用”三节,全章以能量为主线,围绕动能、重力势能、弹性势能、水能、风能及其转化,利用展开讨论,形成机械能的独立体系,本章还具有以下特点: (1)课文着重介绍了弹性势能,增加了动能和弹性势能互相转化的内容和演示实验。 (2)给出了能量的单位——焦耳,便于学生理解功和能之间的关系。 (3)增加了蓄能电站、潮汐电站和我国西南地区小水电站的介绍,意在激发青少年为繁荣祖国而努力学习的责任感。
Chapter 1 Mechanical Energy 1 Characteristics of Textbooks This chapter is closely related to the last chapter of the first volume, “Kung”. It is divided into three sections: “Kinetics and Potential Energy”, “Transformation of Kinetic Energy and Potential Energy”, and “Utilization of Water Energy and Wind Energy”. With energy as the main line, around the kinetic energy, gravity potential energy, elastic potential energy, water energy, wind energy and their transformation, the use of discussions to form an independent system of mechanical energy, this chapter also has the following characteristics: (1) The text focuses on the introduction of elastic potential energy, increased The content and demonstration experiments of the mutual transformation of kinetic energy and elastic potential energy. (2) The unit of energy, Joule, is given to facilitate students’ understanding of the relationship between work and energy. (3) The introduction of storage power stations, tidal power stations, and small hydropower stations in Southwest China is intended to stimulate the sense of responsibility of young people in their efforts to learn to prosper the motherland.