在测平均速度时关键在于准确地计时和准确地测量路程.在现行初中物理教材中,利用秒表、米尺测量从斜面顶端由静止开始下滑的小车的平均速度.在这个实验中,要求测量准确的时间是有一定难度的,由于人的计时快慢造成了偶然误差.下面我介绍一种利用电子表准确地测量时间,从而方便地 The key to measuring the average speed is to accurately measure the time and accurately measure the distance. In the current junior middle school physics textbook, the average speed of the trolley that slides from the top of the slope from the top of the slope is measured by using a stopwatch and a metre. In this experiment, the measurement is required to be accurate. There is a certain degree of difficulty in the time, because of the accidental error caused by the speed of the person’s timing. Here I introduce an accurate measurement of time using an electronic watch, thus conveniently