Stoke’s law states that the viscous force acting on a spherical body of radius 'r' moving with velocity 'v' in viscous media of viscosity 'η' is given by,
F= – 6πηrv.
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Is it necessary to apply some driving force to maintain the flow of liquid through pipe?
Yes, it is necessary to apply some driving force to maintain the flow of liquid through the pipe. The viscous force between the different layers of the liquid will retard the motion of the liquid and flow stops after certain distance.