The friction factor (f), in terms of boundary shear stress ( $τ_{0}$ ), is given by ( $ρ$ = mass density, v= mean velocity)

- 1
  
  $\frac{2 ρ v^{2}}{τ_{0}}$
- 2
  
  $\frac{τ_{0}}{2 ρ v^{2}}$
- 3
  
  $\frac{2 τ_{0}}{ρ v^{2}}$
- 4
  
  $\frac{ρ v^{2}}{2 τ_{0}}$

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