Question

Difference between viscosity and solid friction?​

Answer 1

Answer:

Viscosity

1. Viscosity between layers of the liquid is directly proportional to the area of liquid layers.

2. Viscous force is independent of normal reaction between two layers of liquid.

Solid Friction

1. Solid friction between two solid is independent of the area of solid surfaces in contact with each other.

2. Solid friction is directly proportional to the normal reaction between two surfaces in contact with each other.

Answer 2

Answer:

The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. Friction is due to resistance of relative motion between two solid surfaces whereas viscosity is due to cohesion or adhesion between two surfaces.

Explanation:

Viscous force depends on the velocity gradient and area of contact and frictional force independent of area of contact and relative velocity.

Viscosity of liquid decrease with increase in temperature, Where as friction independent of temperature.

In friction heat is generated at the surface between the solids. When a fluid moves over a solid heat is generated within the fluid.