Solid friction |
Viscosity |
- Independent of surface area
in contact |
Depends on surface area in contact |
Depends on normal reaction (of
one solid surface on the other) |
Independent of normal reaction |
Occurs between solids surfaces
in contact |
Occurs between fluid layers/solid and
fluid in contact/in fluids |
Independent of relative velocity
(between solid surfaces in contact) |
Depends on relative velocity (between fluid
layers) |