Similarities between Friction and Viscosity - QS Study
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Similarities between Friction and Viscosity

Friction is a tenure used to refer to forces that oppose relative motion in general. The property of a fluid for which relative motion between different layers is resisted or retarded is called viscosity. Friction and viscosity refer to forces that oppose the motion.

Explanation

If a ball is allowed to move on a floor, the ball moves a certain distance and then it stops. This is because that no plane or surface is completely smooth. It is non-uniform. When a body tries to move in contact to another body, then upper part of one body enters into the lower part of the other body and between their contact surfaces a resistance force is created. Similarly, if an iron ball is allowed to fall in water that is also resisted by different lavers of water. Here also motion of the iron-ball is slowed down by the viscous force like friction. Again, when a diver goes inside water with a cylinder on his back, in different layers he gets resistance. But in case of a liquid in a confined vessel this type of resistance is not observed. Motion of the diver is resisted by the liquid, because viscosity resists the relative motion of different lavers which affect the easy swimming of the diver. The first event of the two examples is friction and the second one is viscosity.

Common Similarities:

  • Both came in to play whenever there is relative motion.
  • Both opposes relative motion.
  • Both erase from intermolecular force.
  • Both depend on the nature of surface.

But friction and viscosity are both tangential force. Friction is the force relating two contact surfaces. Similarly, viscosity is the intrinsic force to maintain relative motion between two layers of the liquid. The property of a fluid for which relative motion between different layers is resisted or retarded is called viscosity. Viscosity is the general property of all fluids.