When water falls vertically from a tap, the cross-sectionalarea of the water stream gradually:
Correct answer: A. Area decreases
- A. Area decreases
- B. Area increases
- C. Velocity remains same
- D. Area remains same
Explanation
As water falls, it accelerates under gravity increasing velocity; by continuity (A v = constant) the cross-sectional area of the stream decreases.
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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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