10. Gravity The mechanisms of Newton's law of universal gravitation; a point mass m 1 attracts another point mass m 2 by a force F 2 which is proportional to the product of the two masses and inversely proportional to the square of the distance ( r ) between them. Regardless of masses or distance, the magnitudes of | F 1| and | F 2| will always be equal. G is the gravitational constant.