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On the equator or in the neighborhood - the tropics - you weigh definitely less than at or near the poles. But this is not considered to be the result of the centrifugal force. The reason for the difference in the weight of a body with a change in latitude is the difference in the distance of your position from the center of the earth. The weight of an object decreases as the distance from the earth's center increases. The centrifugal force does not have any considerable effect in this case because as per Newton's first law of motion we are in the state of motion and it is natural for us to continue in that state. The centrifugal force will come into play only if there is a change in the velocity or rotation of the earth. Then we shall be thrown off. But this never happens ans at any point on the surface of the earth the speed of rotation is the same.

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