“总结归纳”是在常规课堂的基础上,让学生的学习事半功倍的手段.物理知识的总结与归纳可以体现在物理教学的各个方面.授课时,应及时总结归纳.例如,机械效率指有用功与总功的比,用符号η表示,其表达式为η=W有/W总×100%.计算某机械的机械效率要先求出有用功W有和总功W总.竖直放置的滑轮 “Summarize ” summarizes and summarizes the physical knowledge on the basis of the regular classroom, which enables students to learn more efficiently.Conclusion and induction of physical knowledge can be reflected in all aspects of physics teaching.It should be summarized in time.For example, mechanical efficiency refers to The ratio of useful work to total work, denoted by symbol η, is expressed as η = W / W × 100%. To calculate the mechanical efficiency of a machine, it is necessary to find the sum of useful work W and total work W. Vertical Place the pulley