Strength of Materials
Coulomb friction is the friction between

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

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces meet in a point
the lines of action of these forces are parallel
the lines of action of these forces meet in a point & the lines of action of these forces are parallel
these forces are equal

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