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State the universal law of gravitation
Newton's law of universal gravitation states that a 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 centres.
Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.
The formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth is:
Gravitational force, F = G × 
Where,
G = Gravitational constant
M = Mass of the earth
m = Mass of the object
And R is Radius of the earth
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