The nature of viscosity is:
Correct answer: B. Electromagnetic interactions
- A. Gravitational force
- B. Electromagnetic interactions
- C. Cohesive force
- D. None
Explanation
Viscosity arises because adjacent layers of a fluid exchange momentum through intermolecular electromagnetic forces. These microscopic interactions resist relative motion, producing the internal friction known as viscosity. Cohesive forces are related to surface tension, not viscosity.
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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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