The acceleration of falling body in fluid depends upon:
Correct answer: D. All of above
- A. Velocity
- B. Viscosity of fluid
- C. Density of the body
- D. All of above
Explanation
When a body falls through a fluid, it experiences a resistance force due to the viscosity of the fluid. This resistance force opposes the motion of the body and causes it to slow down. As a result, the acceleration of the body decreases over time until it reaches a terminal velocity. Therefore, all of the above factors - velocity, viscosity of the fluid, and density of the body - influence the acceleration of a falling body in a fluid.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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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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