Strength of Materials
If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

at least two of them must meet
meet in a point
All of the listed here
be all parallel

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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
point of suspension
the point of metacentre
the point of C.G.

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