一、以传统实验为原型的计时与测速以打点计时器为原型是利用这些装置的等时性,不断推陈出新,旨在考查基础知识及基本原理的灵活应用.1·原型:打点记时器问题例1(2004年上海)用打点计时器研究物体的自由落体运动得到如图1所示一段纸带,测得AB=7.15cm,BC=9.17cm.已知交流电频率5 First, using the traditional experiment as a prototype of the timing and speed to take the dot timer as a prototype is the use of these devices isochronism, continuous innovation, designed to examine the basic knowledge and the basic principles of flexible applications. 1 prototype: timing timer problem Example 1 (Shanghai, 2004) studied the free-fall motion of an object with a dotting timer to obtain a piece of paper tape as shown in Fig. 1. The measured AB = 7.15 cm, BC = 9.17 cm. Known AC frequency 5