Dear Srinivas,

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction:

• Dry friction resists relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into static friction("stiction") between non-moving surfaces, and kinetic friction between moving surfaces.

• Fluid friction describes the friction between layers within a viscous fluid that are moving relative to each other.^[1][2]

• Lubricated friction is a case of fluid friction where a fluid separates two solid surfaces.^[3][4][5]

• Skin friction is a component of drag, the force resisting the motion of a solid body through a fluid.

• Internal friction is the force resisting motion between the elements making up a solid material while it undergoesdeformation.

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