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高中乙种本“测定匀加速直线运动的加速度”的学生实验中是直接根据纸带上记录的时间和位移,用公式来计算出匀变速运动的加速度的.其数据处理方法的特点,是采用“逐差法”.逐差法在实验中是一种常用的方法,用它计算加速度时,是把各个位移数据按顺序分组而求对应的位移之差.如:当取6段位移时,是取S_4-S_1、S_5-S_2、S_6-S_3之差,而不是取S_2-S_1、S_3-S_2、S_4-S_3、S_5-S_4、S_6-S_5之差.为什么呢?
In the student’s experiment of “determining the acceleration of uniform acceleration linear motion” in the high school B type, the acceleration and the acceleration of the uniform speed motion are calculated according to the time and the displacement recorded on the tape directly. The characteristics of the data processing method are adopted. “Differential-by-difference method”. The method of subtraction by difference is a common method used in experiments. When calculating acceleration using it, the displacement data is grouped in order to find the difference between the corresponding displacements. For example, when taking 6 displacements, It is the difference between S_4-S_1, S_5-S_2, and S_6-S_3 instead of the difference between S_2-S_1, S_3-S_2, S_4-S_3, S_5-S_4, and S_6-S_5. Why?