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Name: Bryan A.
Status: educator
Age: 30s
Location: N/A
Country: N/A
Date: 3/4/2004
Question:
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 gravity.

Replies:
Yes. Both are true. (2) has a greater effect than (1).

Tim Mooney

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.

Vince Calder


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