8bf0eb34_PMM_physics__About_friction__Type
[...and something about it] Depending from the viscosity of a liquid, the inner friction can be considerable. Inner friction in liquids and gases is the reason for mechanical resistance, when objects are moved through these media. Consequently, objects which are to be moved are streamlined in a suitable way. [Type] 
liquid friction
s l i d i n g f r i c t i o n
r o l l i n g f r i c t i o n
e l a s t i c d e f o r m a t i o n
p l a s t i c / i n e l a s t i c d e f o r m a t i o n
l i q u i d f r i c t i o n
e l e c t r o m a g n e t i c f r i c t i o n
t i d a l f r i c t i o n
s o u n d
PMM physics. About friction
Type