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In combination, the equatorial bulge and the effects of centrifugal force mean that sea-level gravitational acceleration increases from about 9.780 mĚs-2 at the equator to about 9.832 mĚs-2 at the poles, so an object will weigh about 0.5% more at the poles than at the equator.
There is a difference, but it's small.Imagine that you are at the north pole, the earth's spin is just turning you about a vertical axis, so there's no centrifugal force. You still weigh pretty much the same there as at the equator.Actually this is complicated by the fact that, at the poles, you are slightly nearer to the centre of the earth so that also makes you weigh more.
This goes counter to the other explanation