Monday, January 31, 2011

If the earth is round, why don’t people fall off the bottom?


This concept can be well explained by the law of gravity. Earth’s gravity pulls any particular object towards the center of the earth rather than letting it fall down. Isaac Newton explained the law of gravity. He said that, it is not just about a particular object falling towards the earth or something’s speed towards the surface of the earth, instead he said that objects attract each other or fall towards each other. Gravity occurs in objects that have mass. The attraction is much more larger in objects with larger mass than in objects with less mass. The larger an object is the more gravitational pull that particular object is going to have. This is the same with the Earth. The earth is also an object that has a force of pull by gravity. Since the Earth is much more larger than the people or anything which it withholds, the Earth has the ability to hold down whatever “stuff” it consists. If gravity was not in existence then, a person might be traveling in a straight line through space rather than just situating on another object. It does not matter where ever on the earth a person is standing, he/she will experience ‘almost’ the same amount of gravitational pull. Why ‘almost’? Even though, it is said that the earth has the same gravitational pull everywhere on its surface, there are places where this gravitational is a bit less. This is mostly not noticed because these variations in the gravitational pull (vibrations) are very minor compared to total gravitational pull of the earth. Despite these minor vibrations, the earth acts as a magnet with all the objects on it, no matter where ever it is; the pull of gravity is acting same on a person standing at south pole and a person standing at the north pole.

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