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有一类经常可见的力学习题:物体沿着不同的路径从一点运动到另一点,或者物体在不同的条件情况下从一点运动到另一点,比较所用的时间,对这种类型的习题大多数学生感到很棘手,如果所用的方法不当,很难得出正确的结论。如果教师能汇集这类题目,归纳出几种解法,给学生予以介绍,启发学生解这类题的思路与技巧,将会收到较好的效果,本文就对此作一初探供参考。 1 利用比较速度的方法求解物体沿两条不同的路径从一点到另一点,如果路程相等,则可以用比较这两条路径上对应点即时速度值的大小来比较时间。
There is a common type of force learning problem: the object moves from one point to another along different paths, or the object moves from one point to another under different conditions, comparing the time spent, for most students of this type of problem Feeling tricky, it is difficult to draw a correct conclusion if the method used is inappropriate. If teachers can collect such topics, sum up several solutions, give students introduction, and inspire students to understand the ideas and techniques of such questions, they will receive good results. This article will provide an initial reference for this. 1 Use the comparative speed method to solve the object from one point to another along two different paths. If the paths are equal, you can compare the time by comparing the instantaneous speed values of the corresponding points on the two paths.