《运动的合成和分解》是联系简单运动与复杂运动的纽带,且与动力学、动量守恒等教材重要内容的关系十分密切。我在教学实践中发现,有不少问题应引起我们的重视和研究。参照物概念含糊不得我们知道,运动是绝对的,其描述是相对的。描述运动必须明确指出该运动是对哪一参照物而言的。只有以地面或对地静止的物体为参照物的运动,才可以稍有例外,有时可以不提参照物。曾经有过这么两道练习题: 1.小汽艇自己的速度是12千米/小时,河 “Synthesis and disintegration of movement” is the link between simple movement and complex movement, and it is closely related to the important contents of textbooks such as dynamics and conservation of momentum. In my teaching practice, I discovered that there are many problems that should arouse our attention and research. The ambiguity of the reference concept must not be known to us. Movement is absolute and its description is relative. Describe the movement must clearly indicate which movement the reference is for. Only the movement of a reference object on the ground or a stationary object can give rise to slight exceptions. Sometimes reference objects may not be mentioned. There have been two such exercises: 1. The speed of the motorboat itself is 12 km/h.