Strength of Materials
Two coplanar couples having equal and opposite moments

Are equivalent
Balance each other
Produce a couple and an unbalanced force
Produce a moment of couple

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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 are parallel
the lines of action of these forces meet in a point
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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Strength of Materials
Center of percussion is

the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
the point of C.G.
point of suspension
the point of metacentre

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