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初二学生刚开始学习物理,对这门课程颇感兴趣,在学习了《简单的运动》一章后,爱动脑筋的同学提出了这样的问题:“九义”课本习题12、13题(P22)火车通过大桥,计算所用时间,要考虑火车的长度,把火车长度与大桥长度之和作为运动的路程看待,而课本例题二(P20),郑州到南京、上海的火车,计算所用时间,为什么又不考虑火车的长度呢?这个问题提得好.让我们具体进行分析.
The first two students were just beginning to study physics. They were very interested in this course. After learning the chapter “Simple Exercise,” the brain-brought classmates raised this question: “Nine Yi” textbook exercises 12,13 Question (P22) When the train passes through the bridge, the time used for calculation is calculated. The length of the train is taken into account. The sum of the length of the train and the length of the bridge is taken as the distance of the movement. Example 2 of the textbook (P20) is used for the calculation of trains from Zhengzhou to Nanjing and Shanghai. In time, why not consider the length of the train? This question is good. Let us analyze it in detail.