# Solid Friction and Viscosity Similarities & Dissimilarities

0
68

Contents

Read Also- Fluid Mechanics: Objective Questions

## What is Friction?

Friction is the force that opposes the motion. It acts between the surfaces in contact.

There are basically four types of frictions-

• Static Friction
• Sliding
• Rolling Friction
• Fluid Friction

### Definition of Solid Friction

The friction that acts between the surfaces of solid surfaces. Static, Sliding and Rolling Frictions are the examples of Solid Frictions.

### Definition of Viscosity

It is the internal friction of fluid flow. It is the measure of fluid’s resistance to flow.

### 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.

### Similarities

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

Read Also- SSC: Physics Revision Quiz- 01