Stokes’ Law
What Stokes’ Law means in Physics A-Level, as defined for AQA.
Definition of Stokes’ Law
Check what you remember
Read the wording for your board, then hide it and explain Stokes’ Law in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The viscous force on a small sphere is F = 6πηrv, where η is the fluid viscosity, r is the sphere radius and v is the speed.
Topics that use Stokes’ Law
Related terms
- Combining gravitational, viscous and electric forces
- Electric force on a charge
- Electric force on a charged droplet in a uniform field
- Elementary charge
- Equilibrium of forces
- Measurement of elementary charge
- Measurement of small charges and quantisation of charge
- Measurement of the elementary charge
Using Stokes’ Law in the exam
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