Difference between revisions of "Gravitational constant"
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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> | ||
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:<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== | |
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[[Category:Physics]] | [[Category:Physics]] | ||
Revision as of 13:13, April 5, 2017
G is the universal gravitational constant[1]:
- <math> G = 6.67408(31) \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.
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>.