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逐差法是中学物理和大学物理实验中处理数据与减小误差常用的方法之一.笔者认为,无论从适用范围还是从处理效果上来看,高中物理实验《测量匀变速直线运动的加速度》(以下简称《测》)中的逐差法实为误用.一、课本中的纸带处理方法《测量匀变速直线运动的加速度》是高中物理的传统实验之一.实验中,在利用打点计时器获得纸带,处理纸带测定加速度时(如图1),为了减少偶然误差,实验中采用了逐差法.具体计算过程如下:
One of the most commonly used methods to deal with data and reduce errors in physics and physics experiments at middle school and in university is to use the method of difference-difference.I believe that in terms of the scope of application and the effect of processing, the high school physics experiment “measuring acceleration of uniform linear motion” ( (Hereinafter referred to as “test”) the error of the law in the error .A first, the text in the tape processing method “measurement of uniform linear acceleration acceleration” is one of the traditional high school physics experiment.In the experiment, the use of RBI timing Obtained paper tape, paper processing acceleration measured (Figure 1), in order to reduce the chance error, the experiment using the difference method.The specific calculation process is as follows: