At the equator the earth is bulged out a little compared to that in polar region

.

The distance from the centre of the earth to the equator will

be greater than the distance from the centre to the poles.

.

When the height of the object from the earth increases, the force of attraction of the earth on an object increases

According to Newton's

second law of motion , when

the force is applied on an

object there will be an

acceleration on the object.

Hence the effective force of attraction on it will be zero

Acceleration due to gravity when the earth exerts a force on the object , the acceleration experienced by the object is the acceleration due to gravity