What is the difference in the force of gravity of the same body at the pole and equator of the Earth?

The difference is that, strictly speaking, the planet Earth does not have the shape of an ideal ball, but is slightly “flattened” at the edges and therefore looks more like a sphere. Therefore, the distance from the Earth’s center of gravity to the equator R will be slightly less than the distance from the Earth’s center of gravity to the R2 pole.

In addition, the Earth rotates around its axis with a certain angular velocity v. Therefore, the body will also weigh less at the equator, due to the additional action of centrifugal force, while at the pole the body rests together with the pole point.