State stoke’s law and define terminal velocity?

1.	State stoke’s law and define terminal velocity?
Answer» Stoke’s law: When a body falls through a highly viscous liquid, it drags the layer of the liquid immediately in contact with it. This results in a relative motion between the different layers of the liquid. As a result of this, the falling body experiences a viscous force F. Stoke performed many experiments on the motion of small spherical bodies in different fluids and concluded that the viscous force F acting on the spherical body depends on 1. Coefficient of viscosity q of the liquid 2. Radius a of the sphere and 3. Velocity v of the spherical body Dimensionally it can be proved that ∴ F = k ηav Experimentally Stoke found that k = 6π This is Stoke’s law Terminal velocity: Terminal velocity of a body is defined as the constant velocity acquired by a body while falling through a viscous liquid.

Answer»

Stoke’s law:

When a body falls through a highly viscous liquid, it drags the layer of the liquid immediately in contact with it. This results in a relative motion between the different layers of the liquid. As a result of this, the falling body experiences a viscous force F.

Stoke performed many experiments on the motion of small spherical bodies in different fluids and concluded that the viscous force F acting on the spherical body depends on

1. Coefficient of viscosity q of the liquid

2. Radius a of the sphere and

3. Velocity v of the spherical body

Dimensionally it can be proved that

∴ F = k ηav

Experimentally Stoke found that k = 6π

This is Stoke’s law

Terminal velocity:

Terminal velocity of a body is defined as the constant velocity acquired by a body while falling through a viscous liquid.

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