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在进行“运动的合成与分解”这一节内容教学时,做好演示实验至关重要。教材采用在注满水的玻璃管内放一小段红蜡柱来演示运动的合成与分解,该实验装置的不足之处是不能把蜡柱运动的轨迹记录下来,以致学生不易观察清楚蜡柱运动的轨迹。为了弥补这一不足,笔者在教学过程中巧妙地运用磁片来描绘蜡柱运动的轨迹,如图1所示,将玻璃管置于磁性黑板前,手持数片彩色圆形小磁片把蜡柱运动过程中的一系列位置描绘在磁性黑板上,然后把这些磁片连成一条光滑的曲线,得到蜡柱运动的轨迹。
When conducting the teaching of “Synthesis and Decomposition of Exercise”, it is very important to do demonstration experiments. The teaching material uses a small piece of red wax column in a glass tube filled with water to demonstrate the synthesis and decomposition of the motion. The inadequacy of this experimental device is that the trajectory of the wax column motion cannot be recorded, so that students cannot easily observe the movement of the wax column. Track. In order to make up for this deficiency, the author cleverly used magnetic discs to describe the trajectory of the wax column during the teaching process. As shown in Fig. 1, the glass tube was placed in front of a magnetic blackboard, and a small number of colored circular magnetic plates were used to hold the wax. A series of positions during the column movement are depicted on a magnetic blackboard, and then the magnetic slices are connected into a smooth curve to obtain the trajectory of the wax column motion.