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在历年高考中万有引力与航天这部分内容经常考查航天器速度大小的比较,这一热点也正是学生们理解的难点。为了使学生理清这类问题的解题规律,笔者将其归纳为三类基本情况进行详细分析。1.不同圆轨道上速度大小的比较(简称“异轨圆周”)当天体在不同轨道上绕同一中心天体做匀速圆周运动时速度大小的比较,应利用万有引力提供向心力去求。
In the past years of college entrance examination gravitation and space this part of the spacecraft often check the size of the speed comparison, the hot spot is the difficulty students understand. In order to make students sort out the law of solving such problems, the author summarizes the three basic conditions for a detailed analysis. 1. Different circular orbit speed comparison (referred to as “orbital circumference ”) When the celestial bodies in different orbits around the same central celestial body to do uniform circular motion speed comparison, we should use gravitation to provide centripetal force to seek.