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 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

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Strength of Materials
Center of percussion is

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

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