Our science teacher discussed about gravity and suggested a discussion topic: Why are we heavier at the equator?
However, research on the Internet said that we are actually lighter at the equatorial regions than we would be at the poles. This, of course, is due to gravity. The Earth is not a perfect sphere, it is wider at the sides because it is rotating. Our planet's equatorial radius is 22km longer than the radi of the poles. When we are at the poles, we are slightly nearer to Earth's core than we are at the equator. Gravity reduces as distance increases and although this is very small it is a contributing factor. So you would be lighter by about 0.5% when you are at the equator as compared to when you are at the poles.
http://uk.answers.yahoo.com/question/index?qid=20080930080807AAvrnAd
http://www.funtrivia.com/askft/Question25977.html
http://wiki.answers.com/Q/Will_you_weigh_the_same_amount_at_the_equator_as_at_the_North_or_South_Pole&alreadyAsked=1&rtitle=Why_does_an_object_weighs_more_than_it_does_in_the_north_pole_then_the_equator
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