Stokes' Law
Drag force on small sphere in laminar flow is proportional to:
Select the correct option:
Solution
r v
Stokes' Law states that the viscous drag force (Fd) acting on a small spherical body of radius r moving with velocity v through a fluid of viscosity η is: Fd=6πηrv
- The force is directly proportional to the radius (r) of the sphere.
- The force is directly proportional to the velocity (v) of the sphere. This law assumes laminar flow (low Reynolds number) and that the fluid is infinite in extent.
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More stokes' law Practice Questions
A small steel ball falling through a tall column of glycerine eventually moves at a constant speed; ...
A small steel ball falling through a tall column of glycerine eventually moves at a constant speed; ...
A small steel ball falling vertically through a tall column of viscous oil eventually moves at const...
A small steel ball falling vertically through a tall column of viscous oil eventually moves at const...
Sphere radius 1 mm falls steadily in oil (η=0.6 Pa·s), density difference Δρ=900 kg/m³, g=10. Termin...
Sphere radius 1 mm falls steadily in oil (η=0.6 Pa·s), density difference Δρ=900 kg/m³, g=10. Termin...
About This Question
- Subject
- physics
- Chapter
- properties of solids and liquids
- Topic
- stokes' law
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
r v
Stokes' Law states that the viscous drag force (Fd) acting on a small spherical body of radius r moving with velocity v through a fluid of viscosity η is: Fd=6πηrv
- The force is directly proportional to the radius (r) of the sphere.
- The force is directly proportional to the velocity (v) of the sphere. This law assumes laminar flow (low Reynolds number) and that the fluid is infinite in extent.
This medium difficulty physics question is from the chapter properties of solids and liquids, covering the topic of stokes' law. It appeared in the 2025 exam.
Looking for more practice? Explore all physics questions or browse properties of solids and liquids questions on RankGuru.