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“伽利略对自由落体运动的研究”是人民教育出版社普通高中课程标准实验教科书《物理》(必修1)新增的一节内容,也是新教材鲜明特点的一节内容.我们在备课过程中注意到,教材中有这样一段介绍:教材讲到伽利略猜想落体运动应该是一种简单的、速度均匀变化的运动.不过,速度怎样变化才算是“均匀”呢?他考虑了两种可能:一种是速度的变化对时间来说是均匀的,即 v 与 t 成正比,另一种是速度的变化对位移来说是均匀的,即 v 与 x 成正比(这里的x表示位移).课本第49面讲到:“后来发现,如果 v与 x 成正比,将会推导出荒谬的结论.”伽利略是怎样推导的?其结果又是什么呢?教材并没有直接说明.这引起了我们热烈的讨论和探究.
“Galileo’s study of free fall movement ” is the People’s Education Press ordinary high school curriculum experimental textbook “Physics” (compulsory 1) a new section, but also a distinctive feature of the new textbook section of the contents of our lesson preparation process It is noted that there is a description of the textbook: Textbook spoke of Galileo’s guess of falling body movement should be a simple, uniform movement of speed. However, how the speed is considered “uniform”? He considered two Possibly: one is that the change in velocity is uniform over time, ie, v is proportional to t, and the other is that the change in velocity is uniform for displacement, ie, v is proportional to x (where x is the displacement The text on page 49 speaks: “It was later discovered that if v is proportional to x, it would lead to an absurd conclusion.” "How did Galileo deduce? What did the result be? The text did not state directly. This aroused our heated discussion and inquiry.