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'''G''' is the universal gravitational constant:
'''G''' is the universal gravitational constant<ref>http://physics.nist.gov/cgi-bin/cuu/Value?bg</ref>:
:<math> G = 6.67408(31) \times 10^{-11} \ \mbox{N} \ \mbox{m}^2 \ \mbox{kg}^{-2} \ </math>
:<math> G = 6.67408(31) \times 10^{-11} \ \mbox{N} \ \mbox{m}^2 \ \mbox{kg}^{-2} \ </math>
:<math> F = G \frac{m_1 m_2}{r^2} </math>
:<math> F = G \frac{m_1 m_2}{r^2} </math>
where
:<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.
==Acceleration due to Gravity==
The lower case <math>g</math> is known as the acceleration due to gravity. It is the [[acceleration]] of a body experiences due to [[Earth]]'s gravitational field at the [[Earth]]'s surface. It varies slightly across the surface of the earth due to differences in [[altitude]] and local geology. The rotation of the earth also affects it, causing the earth to bulge around the [[equator]], increasing the distance between the surface and the centre of the earth. It has a value of approximately <math> g = 9.81 \ \mbox{m} \ \mbox{s}^{-2}</math>.
==References==
[[Category:Physics]]
[[Category:Physics]]