VARIATION
OF g VARIATION OF ACCELERATION DUE TO GRAVITY




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We know that the force of gravity varies from place to place on the surface of earth.  
There are two reasons behind this variation:  

The shape of earth. The rotation of earth. 


The earth is not a perfect sphere, but bulges at equator. Therefore if a body is taken from pole to equator its distance from the centre of the earth will change. Consequently,the gravitational force also varies.  
VARIATION
OF g WITH ALTITUDE

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Consider the variation of g when a body moves distance upward or downward from the surface of earth.  
Let
g be the value of acceleration due to gravity at the surface of
earth and g' at a height h above the surface of earth. If the earth is considered as a sphere of homogeneous composition, then g at any point on the surface of the earth is given by: 



This expression indicates that the acceleration due to gravity decreases with altitude.  
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