根据课程标准和教学内容的要求,“自由落体运动是什么性质的运动”是“自由落体运动”这节课的重点和难点.这节课的教学设计,教师一般都会用实验探究方式处理这个重难点.笔者对查阅到的相关教学设计案例和观摩的课堂教学进行梳理,根据计时工具的不同进行分类,本实验探究一般有三种设计方案.下面依次介绍.一、打点计时器法图11.实验原理及装置.打点计时器法是教材推荐的、比较常规的实验方法.实验 According to the requirements of the curriculum standards and teaching contents, “What is the nature of free-fall movement?” Is the key and difficult point of this lesson. The teaching design of this lesson is generally used by teachers Way to deal with this heavy difficulty.I read the relevant teaching design case and observe the classroom teaching to sort out, according to the different timing tools to classify, this experiment has three general design options. Figure 11. Experimental principle and device. RBI timer method is recommended by the textbook, more conventional experimental methods. Experiment