3viscous force is a force which is a result of the relative motion between the fluid layers.It is just like frictional force not static.
we know viscous force is 6 (pi)nrv so do we ve viscous force acting b/w layers even if there is no relative motion
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1i know tht thing bt temme suppose i apply a very very little force on a body in water in tangential direction so tht there is no motion . it means sum force is opposing ma applied force if it snot viscosity then wat s tht force.
1n it s given in hcv tht viscous force of a liquid can also be called shear stress
9yes viscosity is 0 wen no relative motion
and viscous force is indeed shear stress of liquid (due to displacement of liquid wen relative motion)
i was telling about shear stress of the rigid body involved and not liquid in #7