Gravitation in everyday life is most familiar as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped. Most people are familiar with gravity as the reason behind things staying on the earth’s surface, or “what goes up, must come down,” but gravity actually has a much vaster significance. Gravity is responsible for the formation of our earth and all other planets and for the movement of all heavenly bodies. It is gravity that makes our planet revolves around the sun and the moon revolve around the earth.
Newton’s first law states that the force of gravity between two masses is directly proportional to the product of the two masses and inversely proportional to the square of the distance between them, or mathematically: F = G(m1m2/d2), where G is a constant. Newton’s second law states that gravitational force is equal to the product of a body’s mass and its acceleration, or F = ma.
Formulas:
Universal Law of Gravitation
Where m1 and m2 are the masses of any two objects under consideration and r1 and r2 are their respective position vectors.
Equation for the gravitational constant
Sir Isaac Newton:
Weight and the Gravitational Force
Sources: www.wisegeek.com/
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