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Canagnus effect take place if windspeed is 0 ? Lets assume that our frame of reference a place an earth (e.g. soccer pitch) .We measure the windspeed and we find it zero.But if we make a knuckleshoot then how is it explained ? What produces the pressure difference in order for ball to change direcrion?

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The ball moves through the air, which results in a flow around the ball. From the viewpoint of the ball, that's a wind.

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  • $\begingroup$ So we can only explain balls curve from ball reference frame? $\endgroup$ – ado sar Dec 30 '18 at 11:45
  • $\begingroup$ Yes. Another example is wind tunnels where we let wind flow and keep models of what we want to study, e.g. cars or airplanes, still. $\endgroup$ – md2perpe Dec 30 '18 at 12:38

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