Strength of Materials
Coulomb friction is the friction between

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

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Strength of Materials
According to principle of moments

if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
positive and negative couples can be balanced
if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

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