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Sigmarus, July 30, 2017 in Classical Physics
It doesn't always, just most of the time - it reduces "form drag" which is one of the factors of air resistance, but it can often increase "skin drag" which is another factor.
Erm is there any simpler but broad explanation of it?
Through wind-tunnel simulations the outer skin of cars and aircraft are designed to be aerodynamically optimized, with low drag and smooth air flow.
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