We calculated that at the altitude of the International Space Station, the value of g has dropped from 9.8 m/s 2 to about 8.75 m/s 2 , and by the time we get out to the distance of the Moon, g has dro...We calculated that at the altitude of the International Space Station, the value of g has dropped from 9.8 m/s 2 to about 8.75 m/s 2 , and by the time we get out to the distance of the Moon, g has dropped to only a couple millimeters per second per second. Unlike in the expression for the gravitational force, the gravitational potential energy depends on the reciprocal of the distance separating the two objects, not the square of the distance.