Strength of Materials
Dynamic friction as compared to static friction is

more
less
same
may be less of more depending on nature of surfaces and velocity

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

these forces are equal
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

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