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Unread 05-01-2009, 00:03
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Re: Propulsion that does not involve driving wheels

The rule specifically describes ways to change the coefficient of friction like putting rubber on the tires, not changing the normal force. Coefficient of friction is different than friction.

Besides, the only way I can think to change normal force without changing mass is a large fan, which would be impractical and be more pain than its worth.
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