14-4 Gravitation near the earth's surface 1. If we combine the law of gravitation and Newton 's second law, we can obtain the acceleration of free fall body near Earth's surface The distance of the body from the earth s center is r M.m F=mgo 0=G2(145) ME is the mass of the earth go is the free-fall acceleration due only to the gravitational pull of the Earth14-4 Gravitation near the Earth’s surface 1. If we combine the law of gravitation and Newton’s second law, we can obtain the acceleration of free￾fall body near Earth’s surface. The distance of the body from the Earth’s center is r. 2 r M m F G E = F = mg0 ｝ 0 2 r M g G E = ME is the mass of the Earth; is the free-fall acceleration due only to the gravitational pull of the Earth 0 g (14-5)