Solid Friction and Viscosity Similarities & Dissimilarities


  • Viscous force is directly proportional to the relative velocity of the layers of liquid under consideration whereas Solid Friction is independent of the relative velocity of bodies in contact.
  • Viscosity is proportional to the surface area of contact of liquid layers whereas Solid friction is independent of the area of surfaces in contact.
  • Viscosity does not depend on the normal reaction between the two layers in contact but Solid Friction does.


  • Both oppose the motion.
  • Both acts tangentially in an opposite direction of motion.
  • The result of intermolecular forces. Both oppose the motion.

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