Strength of Materials
Coulomb friction is the friction between

bodies having relative motion
two dry surfaces
two lubricated surfaces
solids and liquids

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Strength of Materials
Kinetic friction is the

The friction force acting when the body is in motion
Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
The friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction

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