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一、难点分析1.从教材编排方面来看:“机械效率”紧跟在“功的原理”之后,学生在这学习了“功的原理”之后,对于“利用任何机械做功时,动力对机械所做的功等于机械克服阻力所做的功”印象比较深.由于受思维定势的影响,往往会认为:“机械效率”与“功的原理”是相矛盾的,从而为本节的教学设置了思维障碍.再则,本节内容中涉及的公式、物理量又较多,无形中亦增加了教学的难度.2.从学生方面来看:由于机械效率概念涉及到“总功”、“有用功”、“额外功”等概念,而功
I. Difficulties Analysis 1. From the perspective of teaching material arrangement: “Mechanical efficiency ” follows the principle of “work,” after students learn the “principle of work”, for “using any When mechanical work is done, the power done by the power to the machinery is equal to the mechanical work done by overcoming the resistance. ”Impression is deeper. Due to the influence of the mindset, I often think: “Mechanical efficiency” and “Work principle ”It is contradictory, thus setting up thinking barriers for the teaching of this section. Furthermore, the formulas and physical quantities involved in this section are more and more difficult to teach. 2. From the student point of view: Because the concept of mechanical efficiency involves concepts such as total work, useful work, and extra work,