力学是一门古老的同时又是很重要的基础学科。在我们一般学校里,力学实验历来是一个较薄弱的环节,这给初学者带来很大的困难。如果在力学实验的观测上能精确地解决时间与位移的同步测量问题,便可使力学实验大为改观,一些较难理解的力学基本概念和定律,就易为初学者所掌握。 Mechanics is an ancient and very important basic discipline. In our general school, mechanical experiments have always been a weak link, which brings great difficulties for beginners. If we can accurately solve the problem of simultaneous measurement of time and displacement in the observation of mechanical experiment, we can make a great improvement on the mechanics experiment. Some basic concepts and laws of mechanics which are difficult to understand are easy to be mastered by beginners.