* We have learnt that the earth attracts object towards it.
* This is due to the gravitational force.
* Object fall towards the earth under this force alone, We say that the objects are in free fall.
* While falling, there is no change in the direction of motion of the objects
* But due to the earth’s attraction, there will be a change in the magnitude of the velocity. Any change in velocity involves acceleration. Whenever an object falls towards the earth, an acceleration is involved. This acceleration is due to the earth’s gravitational force. Therefore, this acceleration is called the acceleration due to the gravitational force of the earth
##* We know from the second law of motion that force is the product of mass and acceleration. Let the mass of the stone in activity 10.2 be m. We already know that there is acceleration involved in falling objects due to the gravitational force and is denoted by g.
* F = m g
* mg = g (M * m)/ d sqrt
* The earth is not a perfect sphere. As the radius of the earth increases from the poles to the equator, the value of g becomes greater at the poles than at the equator. For most calculations, we can take g to be more or less constant on or near the earth.