在初中物理一册《运动和力》一章的教学中 ,要讨论运动和静止的相对性 ,研究路程、时间和速度的相互关系。为了使学生能直观形象地领悟有关问题 ,我试制成功一台手摇式多功能运动演示仪 ,配合教学演示 ,收到了良好效果。手摇式多功能运动演示仪的构造如图M所示 (图见文末 )。现 In the teaching of the chapter “Sports and Force” in the junior high school physics book, we discuss the relativity of movement and stillness, and study the relationship between distance, time, and speed. In order to enable the students to comprehend the problems intuitively and visually, I successfully produced a hand-held multi-function exercise demonstration instrument and cooperated with the teaching demonstration and received good results. The structure of the hand-operated multi-function exercise demonstrator is shown in Figure M (see the end of the figure). Now