Define gravity and universal law of gravitation and free fall
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GRAVITY is a the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.
UNIVERSAL LAW OF GRAVITATION
Newton's law of universal gravitation states that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
FREE FALL is any motion of a body where gravity is the only acceleration acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it.
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