The drag force is given by_________________?
Correct answer: D. Stokes law
- A. Newtons law
- B. Pascals law
- C. Gauss law
- D. Stokes law
Explanation
For a small sphere moving slowly through a viscous fluid, Stokes' law gives drag force F = 6π η r v, where F is in N, η in Pa·s, r in m and v in m/s. Students may choose Newton's law because it describes motion generally, but Stokes' law specifically gives viscous drag in this situation.
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About Fluid Drag
Fluid drag is the resistive force exerted by a liquid or gas on an object moving through it, and its value depends on speed, fluid density, shape and exposed area. Questions examine drag at low and high speeds, terminal velocity when drag balances weight, and the difference between drag and ordinary solid friction.
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