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人造卫星和航天技术属于现代科技发展的重要领域,特别是近几年来,又一轮的太空探险热的再一次升温和我国“神舟”号飞船的成功发射,以及我国探月计划的进一步实施,使得万有引力定律的知识成为考查热点.下面就“万有引力定律”易错点举例分析.一、重力加速度与向心加速度重力加速度与向心加速度是两个完全不同的概念,对于在地球表面上相对地球静止的物体来说,两者截然不同;而在近地或者在高空中绕地飞行的物体来说,两者等效相等.例1(上海)一卫星绕某行星做匀速圆周运动,已知行星表面的重力加速度为g行,行星的质量M与卫星的质量m之比M/m=81,行星的半径R行与卫星的半径R卫之比R行/R卫=3.6,行星
Satellite and space technology are important areas for the development of modern science and technology. In particular, in recent years, another round of warming of space exploration heat and the successful launching of China’s “Shenzhou” spacecraft, as well as the further exploration of China’s lunar exploration program Implementation, making the knowledge of the law of universal gravitation become a hot spot to examine the following "Gravitation On the surface of the Earth relative to the static object, the two completely different; and in the near-Earth or flying in space around the object, the two equal equivalent. Example 1 (Shanghai) a satellite to do a uniform circumference around a circle Motion, the known gravitational acceleration of the planet surface g line, the mass of the planet M and the mass of the satellite m ratio M / m = 81, the radius of the planet R line and the radius of the satellite R Wei Wei R line / R Wei = 3.6 ,planet