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讲解习题对于物理老师来说是一项很重要的技能.一般来说,只要老师讲得仔细、说得明白,学生就没有弄不懂的题目.可事实往往不尽人意:老师费尽口舌、学生费尽脑力,结果还是两不情愿!笔者就中等水平学校物理教学中的几种实际情况作了详细分析,并针对相应的原因提出了一些可行性的建议.一、一厢情愿型最近讲到一道高考复习题:磁悬浮列车的原理如图1所示,在水平面上,两根平行的直导轨间有竖直方向且等间距的匀强磁场B1和B2,导轨上有金属框abcd,金属框宽度与每个磁
Explaining exercises is a very important skill for a physics teacher, and in general, as long as the teacher speaks carefully, it is clear that there is no problem for the student to understand. The facts are often unsatisfactory: The students exhausted their minds, the result is still reluctant! The author made a detailed analysis of several actual situations in middle school physics teaching, and put forward some feasible suggestions for the corresponding reasons.One, wishful thinking recently talked about one College entrance examination review questions: The principle of maglev train shown in Figure 1, in the horizontal plane, two parallel straight rails between the vertical direction and uniform spacing of the uniform magnetic field B1 and B2, rail with a metal frame abcd, metal frame width With each magnet