Answers

2016-02-03T23:46:50+05:30
Gravity is rather a colloquial term used to refer to earth's gravitational field, which is a result of the gravitational force. The gravitational force, by definition, is a force that acts universally on all bodies, in an attractive way.
Another of the 4 basic forces of nature, electromagnetic force is dual natured, ie, it could be both attractive or repulsive, depending on polarity or sign of charge.
But gravitational force is universally attractive.
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2016-02-04T20:00:53+05:30
Gravity is directly propotional to the mass of earth
 
if u go deep under the earth the mass under u reduces 
 so gravity reduces 

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