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第七章 “机械能” 这一章讲述功和能的概念以及动能定理和机械能守恒定律。这一章可视为牛顿力学的进一步展开。通过引入功和能的概念,在牛顿运动定律的基础上,得出重要的定理和定律,特别是守恒定律,使人们对自然的认识更加深入,并为分析和解决力学问题提供了新的途径。因此,动能定理和机械能守恒定律是本章的重点。逐步地加深理解功和能的概念以及功和能之间的关系,是学好本章知识的基本线索。功和能的概念是逐步扩大和加深的。通过本章的学习,要使学生认识到:各种形式的能可以相互转化,而在转化中保持守恒;功是能的转化的量度。如果不是抽象地、从字面上知道这一点,
Chapter 7 “Mechanical Energy” This chapter describes the concepts of work and energy as well as the kinetic energy theorem and the conservation of mechanical energy. This chapter can be regarded as a further development of Newtonian mechanics. By introducing the concept of work and energy, on the basis of Newton’s laws of motion, important theorems and laws are drawn, especially the law of conservation, which makes people more in-depth understanding of nature, and provides a new way for analyzing and solving mechanical problems. . Therefore, the kinetic energy theorem and the conservation of mechanical energy are the focus of this chapter. Gradually deepening the understanding of the concept of work and energy and the relationship between work and energy are the basic clues for learning this chapter’s knowledge. The concept of work and energy is gradually expanded and deepened. Through the study of this chapter, students should be made to realize that various forms of energy can be transformed into one another, and that conservation can be preserved in conversion; work is a measure of the transformation of energy. If it is not abstractly and literally knows this,