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《中学物理教学参考》2012年10期第39页刊登了程锐老师的一文:《两个博尔特拉着你能跑出5秒的百米成绩吗》(以下称程文)。文中解释了两个博尔特拉着你能跑百米的过程,指出要跑出5秒的成绩是不可能的;还例举了一个运动合成问题,指出一些资料上对这个问题的错误解答。看后颇受启发,但觉得其中有些地方尚可商榷和讨论,故撰文补议两点。先将程文中例举的运动合成问题及其分析解答摘录如下:在教学过程中,我们遇到这样一个问题:如图1所示,两个相
“Physical Education in Secondary School Reference”, 2012 issue 10, page 39, published a article by Cheng Rui: “Is it possible for two Bolters to score a hundred meters in which you can run for 5 seconds?” (hereinafter referred to as Cheng Wen). The article explains the process of the two hundred metre meters that can be run by the two Boltras, and points out that it is impossible to run a five-second performance; it also illustrates a sports synthesis problem and points out some information on the wrong answer to this question. . After reading it, I was inspired, but I feel that some of these places are still open for discussion and discussion. Therefore, the author made two supplementary comments. First, the motion synthesis problem exemplified by Cheng Wenzhong is extracted as follows: In the teaching process, we encountered such a problem: As shown in Figure 1, two phases