一、第一个值得商榷的说法人民教育出版社物理室编著、全日制普通高中教科书《物理》(必修)第一册第七章第六节第130面机械能守恒定律的内容,笔者认为值得商榷,理由如下,敬请同仁指正.原文:在只有重力、弹力做功的情形下,物体的动能和势能发生相互转化,但机械能的总和保持不变.这个结论叫做机械能守恒定律.理由一:根据教材第5面弹力的定义:“发生形变的物 First, the first statement worthy of deliberation. The contents of the law of conservation of mechanical energy, edited by the Physics Department of the People’s Education Publishing House, and the full-time regular high school textbook “Physics” (required), Volume I, Chapter VI, Section VI, I believe it is worth discussing. The reason is as follows, please ask my colleagues to correct me. In the case of gravity and elastic work alone, the kinetic energy and potential energy of the object are converted into each other, but the sum of mechanical energy remains unchanged. This conclusion is called the conservation of mechanical energy. Reason 1: According to the textbook The definition of the 5th surface elasticity: ”The thing that deformed