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Define gravity and explain its variation...

Define gravity and explain its variation, above and below the surface of earth.

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Gravity is the force of attraction exerted by Earth towards its centre on a body lying on or near the surface of the earth. It is the measure of weight of the body. Gravity is a vector quantity. It is always directed towards the centre of earth. Variation of acceleration due
(i) Effect of Height : As we go above the surface of the earth, acceleration due to gravity (8) goes on decreasing vrien
`g . = (g)/((1 + (h )/( R _(e)) ) ^(2))`

As we go below the surface of the earth the acceleration due to gravity (g) goes on deceasing and beomes zero at the centre of the earth.
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