Physics Fluid Dynamics PMDC Conceptual Practice
PMDC Verified Question 12 of 37
When a solid physical body moves through a surrounding fluid medium, it inherently experiences a retarding force known as:
A
Centripetal force
B
Drag force
C
Buoyant force
D
Restoring force
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Drag force
Concept:

Objects moving through fluids experience opposition to their relative motion due to fluid friction and pressure differences.

Formula:

$$ F_D = \frac{1}{2} C_D \rho A v^2 \quad \text{or} \quad F_D = 6 \pi \eta r v $$

Solution:

  • This opposing force is formally defined as the "drag force" (also referred to as air resistance or fluid friction).
  • It acts in the direction directly opposite to the object's relative velocity.


Why other options are incorrect:

Centripetal force keeps an object in circular motion. Buoyant force opposes gravity, independent of velocity. Restoring force relates to springs or oscillatory motion.

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