Calculating “g”
In this lecture we will explore the nature of “g”, the acceleration of gravity, from the characteristics of the centrifugal force that a body experiences on a rotating system. Besides of the fact that the attraction of bodies is described and governed by the Universal Gravitational Law, and the weight of a body is determined by that attraction, the acceleration of gravity is also influenced by the centrifugal force that is determined by the location (latitude) on the planet. The weight we have, depends on our latitude but, maybe more on how much and what we eat. If the planets would not rotate, they would not have a closed spherical form, the climate would be unpredictable irregular, life would have had a very difficult time to evolve and probably never would have done so.
Watch the lecture in the following vide.
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http://www.showme.com/sh?h=3yHI012
AstroDidactics 