在讲授“运动的合成”内容时 ,教材是通过轮船渡河的例子来说明合运动与分运动的关系的 ,学校没有演示实验 ,而教学大纲中有该项内容的演示要求 ,所以笔者介绍一种自制教具实验 ,供大家参考 .一、实验制作在一块竖直放置的演示板上 ,画一个一边沿竖直图 1方向的菱形 dbcd,如图 When teaching “combination of sports”, the textbooks illustrate the relationship between the combined movement and the sub-sports through the example of ferry crossing the river. The school did not demonstrate the experiment, and the syllabus has the demonstration requirements for the content, so the author introduces a Self-made teaching aid experiment, for your reference. First, the experimental production on a vertical placement of the demo board, draw a side along the vertical direction of the diamond Figure 1 dbcd, as shown