对光电门测得的瞬时速度的误差分析  

Analyzing the errors in instantaneous velocity measured with photogate timer

作　　者：周勇[1] 李更磊[1] 郑小平[1] 

机构地区：[1]华中师范大学物理科学与技术学院,湖北武汉430079

出　　处：《物理实验》2009年第1期24-26,共3页Physics Experimentation

摘　　要：以"摆球法验证机械能守恒定律"实验为例,通过2种方法分析了由光电门测得的摆球瞬时速度的误差.得出了在中学一些实验中由光电门测得的物体的瞬时速度值小于它的实际值的结论.With the example of the experiment of validating the conservation law of mechanical energy using single pendulum, the errors in the instantaneous velocity of the pendulum measured with photogate velocity m timer easure are analyzed with two methods. The conclusion is that the values of the instantaneous d with photogate timer in some experiments are smaller than the real ones.

关 键 词：平均速度 瞬时速度 光电门 误差 

分 类 号：O311[理学—一般力学与力学基础]