WHICH WAY DOES SHEAR MOVE?
Rises, falls, or stays put?
Wall shear stress in a wide, shallow channel is τ = 6μQ ÷ (w h²). Read each change and decide what happens to τ.
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CHALLENGE COMPLETE
🌊 You can predict shear
+50 XP
Shear grows with flow and viscosity, falls with width, and falls with the square of height. Channel length does not change it.