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Expanding Gas
Inertia
Thrust
Friction
Surface Friction
Fluid Friction
Speed
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Friction

Friction a: the rubbing of one body against another; b: the force that resists relative motion between two bodies in contact.
(Source: Merriam-Webster's Collegiate Dictionary)
Fluid Friction Surface Friction
Friction
Two types of friction come into play with CO2 racecars: surface friction and fluid friction. Both of these are inversely proportional to speed!

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