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Viscous force is somewhat like friction ...

Viscous force is somewhat like friction as it opposes the motion and is non-conservative but not exactly so because

A

It is velocity dependent while friction is not

B

It is velocity independent while friction is not

C

It is temperature dependent while friction is not

D

It is independent of area while friction is dependent

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The correct Answer is:
ac
Friction is independent of velocity and temperature. Viscous force depends on temperature as `eta` varies with temperature.
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When a liquid flows in a tube, there is relative motion between adjacent layers of the liquid. This force is called the viscous force which tends to oppose the relative motion between the layers of the liquid. Newton was the first person to study the factors that govern the viscous force in a liquid. According to Newton’s law of viscous flow, the magnitude of the viscous force on a certain layer of a liquid is given by F = - eta A (dv)/(dx) where A is the area of the layer (dv)/(dx) is the velocity gradient at the layer and eta is the coefficient of viscosity of the liquid. The dimensional formula for the coefficient of viscosity is :

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