Gravitational constant

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G is the universal gravitational constant:

 G = 6.67 \times 10^{-11} \ \mbox{N} \ \mbox{m}^2 \ \mbox{kg}^{-2} \

It is used in Newton's formula for the gravitational force between two objects, which is:

 {F} \ is the force between the two objects
 {m_1},{m_2} \ are the masses of each object
 {r} \ is the distance between the two objects.

g is the acceleration Earth's gravitational field exerts on objects at Earth's surface:

 g = 9.81 \ \mbox{m} \ \mbox{sec}^{-2}
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