九年义务教育初中物理教材第一册第二章《简单的运动》中的第三节测平均速度的实验，由于实验时使用的仪器存在缺点和不足之处，在分组实验中，需由两名同学配合完成，难度较大；而且在计时的同时还要测量路程，增加了产生误差的机会，致使实验结果的准确率较低，达不到预期目 The experiment of measuring the average speed in the third section of the second-year compulsory education junior middle school physics textbook Book One Chapter 2 “Simple Exercise”, due to the disadvantages and deficiencies of the instruments used in the experiment, in the grouping experiment, it needs to consist of two The completion of the classmates is difficult, and the distance must be measured at the same time, which increases the chance of errors and results in a lower accuracy of the experimental results and does not reach the expected goal.