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一、问题提出与分析本节课的教学内容是人教版必修二第六章万有引力与航天第五节宇宙航行。教材引入牛顿的设想一把物体从高山上水平抛出,如果速度足够大,物体就不再落回地面,成为绕地运动的人造地球卫星。利用人造地球卫星绕地球运行,地球对卫星的万有引力提供卫星做匀速圆周运动的向心力,推导出物体在地面附近绕地球做匀速圆周运动的速度,即第一宇宙速度,进而提出第二宇宙速度,第三宇宙速度。最后,教材介绍了人类和我国迈向太空的科学史,激发学生的民族自豪感~([1])。寥寥数笔介绍完毕。
First, the problem raised and analyzed The teaching content of this lesson is the PEP 2 Compulsory Sixth Chapter V universal gravitation and space flight v. Astronautics. Textbooks Introduced Newton’s Assumption An object is thrown from a high mountain. If the velocity is large enough, the object no longer falls back to earth and becomes a man-made earth satellite moving around. Using man-made earth satellites orbiting the earth, the Earth’s gravity to the satellites provides the centripetal force of the satellites to perform uniform circular motion, and deduces the velocity at which the object moves around the earth at constant circular orbit around the earth, that is, the first cosmic velocity, and then proposes the second cosmic velocity. Third universe speed. Finally, the textbook introduces the history of science into space for mankind and our country, arousing students’ pride in their nation ~ ([1]). A few pen introduction is completed.