Have you ever wondered how much the rotation of the Earth affects your apparent weight? You can simplify this problem by assuming the Earth is a perfect sphere (not true) and that the acceleration of gravity is always 9/8 m/s. all over the Earth (also not true). You'll see why these two assumptions are false but good enough. write an equation for the sum of the forces for a person standing on the equator. is their weight different than if they were standing on the north pole? if so, by what percent difference up or down?