Q.

Drag force is affected by__________

A. Cross sectional area and smoothness
B. Rigidity and density
C. Pressure and temperature
D. Mass
Answer» A. Cross sectional area and smoothness
Explanation: Drag force is affected by cross sectional area and smoothness. If it is affected by cross sectional area, then it is called form drag. If it is affected by surface smoothness, then it is called as surface drag.
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