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# Variation of g with rotation?

I am not able to understand the variation of g with rotaion. where from the omega square comes? please explain elaborately.
Member since:
November 10, 2007
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## Best Answer - Chosen by Voters

Is this about variation of g on the surface of the earth due to the earth's rotation?

No, g does not vary due to rotation. But some of the force of gravity is offset by the outward force due to the rotation. This apparent variation in g is a maximum of 0.3% at the equator.

omega square? do you mean ω² ?
as in:
acceleration (outward) at rim is a = rω² ?

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• by Josua
Member since:
March 14, 2012
Total points:
503 (Level 2)
Omega is actually the rotational speed which occurs because of the centripetal pressure. g(gravity) is really a constant amount at fixed range from the middle of the planet earth.