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人教版高中物理必修二“宇宙航行”一节中有关卫星的“发射速度、宇宙速度、环绕速度”概念的理解给学生学习造成了一定困难,还有不少学生不能很好地理解三个宇宙速度的含义。通过第一宇宙速度的推导,三个宇宙速度的比较,环绕速度的分析,能有效、深层次地理解人造卫星的三种速度。
The understanding of the concept of “launch speed, cosmic speed, and surrounding speed” of satellites in the “Pilots” section of the Pilgrim’s High School Physics Compulsory 2 “Astronautics” has caused some difficulties for students’ learning and many students can not do well Understand the implications of the three cosmic speeds. Through the deduction of the first cosmic velocity, the comparison of three cosmic velocities and the analysis of the surrounding velocity, the three velocities of satellites can be effectively and deeply understood.