Strength of Materials
Coulomb friction is the friction between

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

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

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Strength of Materials
The weight of a body is due to

gravitational force of attraction towards the centre of the earth.
force of attraction experienced by par-ticles
gravitational pull exerted by the earth
centripetal force of earth

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