Difference between revisions of "Gravitational constant"
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:<math> G = 6.67 \times 10^{-11} \ \mbox{N} \ \mbox{m}^2 \ \mbox{kg}^{-2} \ </math> | :<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: | + | 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 = G \frac{m_1 m_2}{r^2} </math> | ||
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::<math> {r} \ </math> is the distance between the two objects. | ::<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: | + | '''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> | :<math> g = 9.81 \ \mbox{m} \ \mbox{sec}^{-2}</math> | ||
[[category:physics]] | [[category:physics]] | ||
Revision as of 13:15, September 10, 2007
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>
- 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.
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>