Friction is the resistive force between two bodies when they slide against each other. Friction is not itself a fundamental force and is a combination of several other processes and principles. It is a non-conservative force which is path dependent. The different types of friction are:

•          Dry Friction: The frictional force that opposes 2 solid surfaces.

•          Fluid Friction: The frictional force between the layers of a viscous fluid.

•          Lubricated Friction: The frictional force where a fluid separates 2 solid surfaces.

•          Skin Friction: The dragging frictional force that resists the motion of a fluid across the surface of the body.

•          Internal Friction: The frictional force that resists the motion between the elements that makes up a solid material.

Coefficient of friction (COF) is a scalar quantity that describes the ratio of the force of friction between 2 bodies. There is no loss of energy due to friction. It gets transformed into other forms of energy, mainly thermal energy.

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