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Calculating the friction of air upon the linear, angular velocity of a sphere?

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I played with this not so long ago. Drag in air is probably going to be turbulent (as opposed to laminar), so the equation looks like what's found here (check out "drag at high velocity").

You can set your drag coefficient to whatever you like, though a realistic value is something in the .2 to .4 range.

Check out this Bluff body calculator to see how it works in code. Right click on the page and select "view source" to see the source code he uses to calculate the different things.

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