Viscous force like friction force opposes relative motion

Last updated: 6/7/2023

Viscous force like friction force opposes relative motion The viscous force between two layers depends on area of the layers and velocity gradient whereas friction force is independent of macroscopic area A massless block of base area A is placed on a table in such a way that a layer of thickness of a liquid of coefficient of viscosity n exists between the lower surface of block and the table as shown in figure To one end of the block a spring of stiffness k is connected and to the other end a constant force F is applied Initially spring is in natural length mmmmmm TT The time after applying the force F when extension in the spring becomes A 2 n ko n kw 100 n2 F 2k is