Local Gravitational Acceleration
Name: Bryan A.
Assuming the same elevation, is there a difference in gravity at either of the Poles and the equator?
Would gravity be less at the equator because...
1) The diameter across the equator is greater than the distance
between the Poles, increasing distance from Earth's center of mass
despite equal elevation in relation to sea level.
2) Centripetal force is greater at the equator which counters a bit of
Yes. Both are true. (2) has a greater effect than (1).
Small but measurable local changes in the acceleration of gravity reflect
numerous factors including those you mention. But even the type of rock, the
porosity of the ground, water depth, and a long list of other factors come
into play. The acceleration of gravity is not a monolithic quantity and many
factors influence it.
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Update: June 2012