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瞬时速度对应的是时刻,无法通过实验直接测量,能够测量的是平均速度。实验中往往用一段很短的位移内的平均速度来近似代替瞬时速度。平均速度是用一段时间内物体通过的位移除以这段时间定义的,所以平均速度v与位移△s和时间△t存在内涵上的紧密关系。通过适当的公式代换消去国;△s或△t,得到v与△s、△t分别存在线性关系,即可通过DIS实验系统测量多组离散数据,绘制在坐标系上后进行线性拟合再外推至瞬时速度。本文基于这种线性函数外推的思想,设计了诸种实验方案。
Instantaneous speed corresponds to the moment, can not be measured directly through the experiment, can measure the average speed. Experiments often use a short period of displacement within the average speed to approximate the instantaneous speed instead. The average velocity is defined as the displacement of an object passing over a period of time divided by the period of time so that the mean velocity v has a connotation close relationship with the displacement Δs and the time Δt. By using the appropriate formula to replace the elimination country; △ s or △ t, we obtain the linear relationship between v and △ s and △ t, then we can measure several groups of discrete data by DIS experiment system and draw the linear fitting Extrapolate to instantaneous speed. Based on the idea of linear function extrapolation, this paper designs various experimental schemes.