Question

__State Stokes Law?​

Answer 1

Define Stokes Law.

The force required to move a sphere through a given viscous fluid at a low uniform velocity is directly proportional to the velocity and radius of the sphere.

Answer 2

Explanation:

Stokes law :

According to stoke,s law the backward viscous force acting on a small spherical body of radius r moving with uniform velocity v through fluid of viscosity ( n ) is given by :

F. = 6 pie n r v.

The viscous force acting on sphere moving through a fluid depend on:

Cofficient of viscosity

Radius r of the spherical body

velocity v of the body

Condition under stoke,s law valid :

• The fluid through which the body moves has infinite extension
• .....
• The body is perfectly rigid and smooth
• There is no slip between the body and fluid .
• The motion of body dose not give rise to turbulent motion and eddies .Hence motion is streamlined.

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