Newton’s law of universal gravitation and laws of motion are named after Sir Isaac Newton, an English physicist, mathematician, and astronomer. Newton first published his work Philsophiae Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) in 1687. Newton’s law of universal gravitation states that gravitational force decreases with distance and mass. Newton’s laws of motion describe the relationship between forces acting on a body and its motion due to these forces. Newton used universal gravitation, along with his laws of motion, to substantiate Kepler's laws of planetary motion.