**The frictional resistance for fluids in motion is**

a) proportional to the velocity in laminar flow and to the square of the velocity in turbulent flow

b) proportional to the square of the velocity in laminar flow and to the velocity in turbulent flow

c) proportional to the velocity in both laminar flow and turbulent flow

d) proportional to the square of the velocity in both laminar flow and turbulent flow

**Answer:**

a) proportional to the velocity in laminar flow and to the square of the velocity in turbulent flow

**Explanation:**

rf / v (for steady streamline flow) and rf / v2 (for turbulent flow) are the laws of fluid friction, where rf is the frictional resistance and v is the flow velocity.

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