我们对高中学生讲到自由落体运动时,为了使学生正确地巩固地认识这一问题,首先要掌握下面三个环节:第一要说明自由落体运动是直线运动。第二要说明它是加速运动。第三还要说明它是匀加速运动。据我们的经验在教学过程中,关于第一个环节说明落体运动的轨跡是直线的,不论是在教师讲授方面或是在学生领悟方面,都丝毫不感觉任何困难。可是在讲到 When we talk about high school students’ free-fall movement, we must first grasp the following three steps in order to enable students to correctly understand the problem: First, it shows that free-fall movement is a straight-line movement. The second one is to show that it is accelerating. The third also shows that it is uniform acceleration. According to our experience, during the teaching process, the first link shows that the trajectory of the falling body movement is a straight line. It does not feel any difficulty in terms of teacher teaching or student understanding. But talked about