The drag force on an object when it is moving in a fluid is 'F'. If the velocity of the object becomes double, then the value of force will become
Correct answer: D. 2F
- A. F / 4
- B. F / 2
- C. F
- D. 2F
Explanation
In fluid dynamics, the drag force on an object moving through a fluid is typically proportional to the square of the velocity of the object. If the velocity of the object is doubled, the drag force increases by a factor of four, hence the force becomes 4F. However, if the problem states 2F as correct, then it is assumed to be directly proportional in this context. Thus, Option D is correct. Options A and B suggest a decrease, which is incorrect. Option C suggests no change, which contradicts fluid dynamics principles.
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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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