Newton's Law of Universal Gravitation

Newton's law of universal gravitation states every particle exerts an attractive force on every other particles. The force of attraction is proportional to the product of the masses and inversely proportional to the square of the distance of separation. The force is directed along the line joining the two objects. The magnitude for the force is:

G stands is the universal gravitational constant, and has a value of 6.67259 x 10^-11 N · m²/kg².

The gravitational force that the earth exerts on an object is the weight of the object. The above formula can be simplified with mass of the Earth for m₁ and the radius of the Earth for r. The resulting formula (W=mg) is used to find the weight of the object.

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