教学《摆的秘密》一课,有两个环节经常影响教学活动进行: 一是学具多而零散,不易操作。在分组实验中,学生需要用三个摆(1号摆,2号摆,3号摆)。其中,2号摆与1号摆的摆线长短相同,摆锤比1号摆重,3号摆与1号摆的摆锤轻重相同,摆线比1号摆短。这组 Teaching “put the secret” a lesson, there are two aspects often affect the teaching activities: First, learning more and fragmented, not easy to operate. In group experiments, students need to use three pendulums (pendulum 1, pendulum 2, pendulum 3). Among them, the No. 2 and No. 1 pendulum placed the same length, pendulum than No. 1 placed on the 3rd placed pendulum weight on the 1st, the same weight, cycloid shorter than No. 1. This group