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A fundamental force in the universe, and one that is characteristic of all matter, is gravity. It is a force that always acts to attract one mass to another.
All objects attract each other through the force of gravity. The equation is ...

F = G(Mm/r2)

... where F is in newtons, G is the universal gravitational constant 6.674 x 10-11 N m2 kg-2, M and m are the masses of the two objects in kilograms, and r is the distance between the two objects in meters.

Note that there are other forces, such as the weak interaction, the electromagnetic force, and the strong interaction, that also come into play, particularly at atomic and sub-atomic scales, but gravity reigns supreme over all longer distances.

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12y ago

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