研究平抛物体的运动实验,新教材与老教材相比,虽然有两点改进,用坐标纸代替白纸,用铅笔试碰找出小球经过的位置,但是,在桌边做这个实验,坐标原点很难记录准确,在重复实验过程中,很难使木板跟斜槽的相对位置保持不变,用铅笔找小 To study the motion experiment of flat parabolic objects, the new textbook compared with the old textbook, although there are two improvements, use paper instead of white paper, use a pencil to try to find out the position of the ball passing, but do this experiment at the table, The origin of the coordinates is difficult to record accurately. During the repetition of the experiment, it is difficult to keep the relative position of the wood and the chute unchanged.