variation of g due to rotation of earth
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Rotation of Earth creates a Centrifugal force
Mv^2/r
As the r changes so does the Centrifugal force. So zero Centrifugal force will be at poles as r is zero and maximum Centrifugal force will be at equator as r is equal to R.
Centrifugal and gravitational force are opposite in direction. So gravitational will be relatively less on equator and more on poles because of the rotation of Earth.
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