Gravitational constant

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G is the universal gravitational constant:

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

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

<math> F = G \frac{m_1 m_2}{r^2} </math>
<math> {F} \ </math> is the force between the two objects
<math> {m_1},{m_2} \ </math> are the masses of each object
<math> {r} \ </math> is the distance between the two objects.

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

<math> g = 9.81 \ \mbox{m} \ \mbox{sec}^{-2}</math>