Which of the following forces does not act on a fluid at rest ?
Correct answer: A. Viscous force
- A. Viscous force
- B. Gravity force
- C. Hydrostatic force
- D. Surface tension force
Explanation
A fluid at rest cannot sustain a viscous shear force because there is no relative motion between adjacent layers. Gravity, pressure forces and surface tension can still act on a stationary fluid.
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