Strength of Materials
Frictional force encountered after commencement of motion is called

frictional resistance
limiting friction
dynamic friction
post friction

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Strength of Materials
According to principle of moments

positive and negative couples can be balanced
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 their algebraic sum is zero
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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