“机械效率”是初中《物理》沪科版《机械与人》一章中的教学难点,如何突破“机械效率”的学习难点,是物理教学中的疑难问题。笔者在教授该课时,博彩众长,吸取其他教师的经验并结合自身的教学经验,总结了四种方法来引导学生突破该难点。 “Mechanical Efficiency ” is a difficult teaching point in the chapter “Mechanics and Humanities” of Shanghai Physics Publishing House in junior middle school. How to overcome the learning difficulties of “Mechanical Efficiency ” is a difficult problem in physics teaching. When I taught the class, the author of gambling, draw on the experience of other teachers and their own teaching experience, summed up the four ways to guide students to break through the difficulties.