Which of the following is the best graphical representation between drag force 'F' on a spherical object of radius 'r' and its speed 'v' through a fluid of viscosity 'η'?
Correct answer: A. A
- A. A
- B. B
- C. C
- D. D
Explanation
The equation of stokes law (F = 6πrην) shows that force and velocity are directly proportional to each other for a sphere with constant radius 'r' moving through a liquid of viscosity n. Hence the graph must be a straight line passing through the origin.
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About Fluid Dynamics
Fluid flow is described through speed, pressure and density, including steady flow and the equation of continuity for conserving mass. Bernoulli's equation relates pressure, speed and height, while fluid drag and terminal velocity explain why a falling object eventually moves at constant speed when drag balances its weight.
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