One object attracts the other object with a force that is proportional to the product of the masses of the two objects, and inversely proportional to their separation. Write an expression for the acceleration of the planet by the Sun. Find student's acceleration due to Earth's gravitational force. Force of gravity is the weakest force in nature.
Force of gravity is always attraction.
Newton's Law of Gravitation accounts for planetary motions, and free-fall motions of objects on planets. Theory of General Relativity is a better theory of gravity. Einstein's Gen. Rel. Gen Rel can explain more gravitational phenomena in nature than Newton's Law of gravity. Black Holes exert very strong gravitational forces only at small distances.