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Old 21st Jan 2012, 10:57
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cwatters
 
Join Date: Dec 2001
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Trick question? On the ground there is an additional fifth force provided by the ground. So the four forces you are familiar with don't have to balance on their own.

The force provided by the ground would probably be called the "reaction force provided by the ground".

Actually it's six forces at least... I forgot friction between tyres and the ground so thrust and drag don't have to balance either.
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