What is the affect of rotation of the earth on acceleration due to gravity?

Gravity is pretty constant figure anywhere on earth, essentially its dependent on your distance from the center of gravity of the earth, nominally it will produce an acceleration of 9.81((m/s/)/s) at the earths surface. Gravity is dependent on mass and independent of motion , ie mass of earth attracting mass of person , attraction being proportional to total mass of both and distance between their centers of gravity.

However , a very small opposing acceleration outwards is experienced because you are rotating about the earths axis (centrifugal action) , its maximum effect is on the equator and zero effect at the poles.

this acceleration can be calculated from:

a = (v^2)/r where:

a = acceleration ((m/s)/s)

v = velocity (m/s)

r = radius or normal distance from earths axis (m)