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For general Physics concepts, like here on Wiki.answers, I usually use 9.8 m/s2.

Here are a few figures that are more precise:

Equator
. . . sea level: 9.780
. . . 10 km . . . 9.749

Latitude 45 degrees
. . . sea level: 9.806
. . . 10 km . . . 9.775

Pole
. . . sea level: 9.832
. . . 10 km . . . 9.801

"Handbook of Geophysics and the Space Environment", Air Force Geophysics Laboratory, 1985.

The exact value of gravity on earth varies depending on where you measure it. Gravity at the poles is more than at the equator. On the top of Everest it is less than at the shore of the Dead Sea.

The force exerted on an object by gravity is stronger as the object gets closer to the gravitational source referenced. In the case of earth, we know that its shape is not a perfect sphere. It is actually an oblate spheroid, and the equator is "bulged out" a bit with the poles ever so slightly flattened. This puts the poles closer to the center of earth's gravity. Objects on the poles will weigh more than they will at the equator.

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15y ago

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