Question

explain why the value of g changes from poles to equator on the surface of the earth

Answer 1

Because at different areas the gravitational pull is different. At the centre of the earth the gravitational force is maximum and at the poles it is least

Answer 2

on the poles, the earth is little flat, so the radius of earth is less, so distance between object and center of earth will be less. so g will be more .on the equator, the radius will be more and so distance will be more. so g will be less