高中物理“人造地球卫星及其应用”一节课本上是由牛顿从抛体运动的推论引入的.牛顿的推论,既容易理解,又难以理解.说容易理解,抛体运动司空见惯,在抛射角一定时,抛射速度越大,抛得越远.说难理解,对高一学生来说,速率足够大的抛体,永远向地面落而又永远落不到地面上.这有点不可思议.所以,我在这节新课时,把这部分内容留给学生自己阅读,而首先举了个汽车过桥的例题. The textbook “Sci-Tech Earth Satellite and its Applications” was introduced by Newton from the inference of the projectile movement. Newton’s reasoning is both easy to understand and difficult to understand. It is easy to understand, and the projectile movement is commonplace in the projection angle. At a certain time, the bigger the ejection speed, the farther it is thrown. It’s hard to understand that for the first-year students, the throwing body with enough velocity will always fall to the ground and never fall to the ground. This is a bit weird. So, When I was in this new class, I left this part of the content for the students to read on their own, and first raised the example of a car crossing the bridge.