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Why g is called the universal gravitational constant.

Answer:

Because it's the constant in Newton's Law of Universal Gravitation.

It's "gravitational" because it is related to gravity; "universal ... constant" because it is the same in all cases.

"Universal" because it applied to the whole of the Universe.

Another answer. But, g isn't called the universal gravitational constant.

g is the acceleration due to gravity on our planet only.= 9.81 m s-2

The universal gravitational constant is G (often called big G ) = 6.673 x 1011 m3 kg-1 s-2.

It appears in Newton's equation f= Gm1m2 / d2 .

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Why G is called universal constant?

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