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With the growing population and building of stuff....does the little we do affect the strength of Earths gravity ? .
You see, I'm losing weight and I need to know this to factor in the gravitational differences between May this year (2008)....when I started ....and a year from now !
the Earth's equatorial bulge (itself also caused by centrifugal force) causes objects at the equator to be farther from the planet's centre than objects at the poles. Because the force due to gravitational attraction between two bodies (the Earth and the object being weighed) varies inversely with the square of the distance between them, objects at the equator experience a weaker gravitational pull than objects at the poles.In combination, the equatorial bulge and the effects of centrifugal force mean that sea-level gravitational acceleration increases from about 9.780 mĚs-2 at the equator to about 9.832 mĚs-2 at the poles, so an object will weigh about 0.5% more at the poles than at the equator.