Acceleration due to gravity is given by Gravitational Force
Force = GMm/r 2
The acceleration due to gravity is given by
g = GM/R 2
where G = Gravitational Constant
M = Mass of earth
R = Distance of object from center of earth
Earth is not perfectly spherical. Distance of center from poles is less than distance of center from equator
Since r is less in poles, g will be higher.
And r is more in equator, g will be lower.
Therefore, gravity is maximum at poles and minimum at the equator
Let's actually find the value of g in equator and poles