Gravitational Force
...ze of their masses. That is, the larger either mass is, the larger the force is between the two objects. The theory refers to mass rather then weight because the weight of an object on the earth is really the strength of the earth's gravity on that object. On different planets, the same object would have different weights, but its mass would always be the same. The gravitational force is inversely proportional to the distance between the centers of gravity of the two objects squared. For example, if the distance between the two objects doubles, the force between them becomes a fourth of its original strength. Einstein's theory of gravitation came as a part of his general theory of relativity. An essential idea of general relativity is that gravitation is an effect of the curvature of space and time. The general theory of relativity is based on two assumptions. The first assumption of Einstein's theory is that space and time are curved wherever matter or energy is present. He provided equations that desc...