Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. The force of gravity on Earth is the resultant (vector sum) of two forces: (a) The gravitational attraction in accordance with Newton's universal law of gravitation, and. Newton's Law of Universal Gravitation is used to explain gravitational force. 024 - Gravitational Force In this video Paul Andersen explains how an object with mass placed. The gravitational force is a force that attracts any two objects with mass. Gravity is the force by which a planet or other body draws objects toward its center.