Can someone explain the similarity between friction and viscous force?
This is what I have understood:
Friction and viscous force come into play in presence of relative motion. They are dissipative and both are dependent on a constant ,unique for a medium.
The very famous saying "A body is accelerated if there is an external force acting on it". Is it violated for liquids ? Every layer is acted upon by an external force (viscous friction) but the acceleration of a particular layer is nil.
Now why does friction brings a body to rest but viscous drag doesn't stop a liquid completely ?
Friction doesn't maintain the velocity of a body but viscous force does not change the velocity of a particular layer.
Why does viscous force depend on area and velocity but friction is independent of it?
Assistance using simple terms will be appreciated.