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闪光照片是分析力学问题的很好手段,现行教材中已得到应用。我们尝试用闪光照片帮助学生分析一些习题,尤其是有争议的习题,效果较好。这样做,有利于培养学生理论联系实际的正确的学习物理的方法,也有利于学生从“题海”中解脱出来。下面举几个例子:[例1]长为 l 的绳子,一端拴一质量为m的小球,另一端固定于 O,在 O 的正下方 l/2处有一钉子 O’,现将绳子拉到水平位置后由静止释放,求小球上升的最大高度,如图1。
Flash photos are a good way to analyze mechanics problems and have been applied in current textbooks. We try to use flash photos to help students analyze some exercises, especially controversial exercises, and they work better. In doing so, it is conducive to cultivating students’ correct method of physics combining theory with practice, and it is also helpful for students to escape from the “question”. Here are some examples: [Example 1] A rope of length l has a ball with mass m at one end, and the other end is fixed at O. There is a nail O’ just below the point O of O, and now the string is pulled. After it reaches the horizontal position, it is released from the rest position, and the maximum height of the ball is shown in Figure 1.