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Originally posted by oddguy 999
Spining fast dose decress the aparent surface gravity through centrapetal motion around the eqator- which flatens the planet out making the poles come closer together which lowers the average gravity quite a bit...
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That's why, Anna. It doesn't actually reduce the gravity, it just increases the centrapetal force which makes it seem like there were less gravity.
Here's a practical experient for you: Sit on a round-about and spin it. The faster it spins, the more you get pulled outwards. The same happens with planets.