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现行高中物理课本(甲种本和乙种本),都有测匀变速运动的加速度的实验内容,而对打点计时器记录下的纸带进行分析,求加速度的时候,一般有两种方法:计算法(由△S=αT~2算)和图象法(作速度一时间图象,速度图线的斜率就等于加速度)。关于用计算法求加速度时,往往要求几个量的平均值。这当中却存在着某些不必要的计算,同时还增加了测量长度时的误差。本文仅就计算法中的某些问题加以讨论,希望能够求得较好的解决办法。
In the current high school physics textbooks (A and B editions), there are experimental contents for measuring the acceleration of a uniform speed-changing movement. When analyzing the tapes recorded by the dotting timer, the acceleration is generally determined in two ways: Calculation method (calculated by ΔS=αT~2) and image method (for velocity-time image, the slope of velocity graph is equal to acceleration). When calculating the acceleration using a calculation method, an average of several quantities is often required. There are some unnecessary calculations in this, but also increase the error when measuring the length. This article only discusses some issues in the calculation method and hopes that a better solution can be obtained.