Strength of Materials
Center of percussion is

the point of metacentre
point of suspension
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.

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Strength of Materials
Limiting force of friction is the

Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction
The friction force acting when the body is just about to move
the friction force acting when the body is in motion
Ratio of limiting friction and normal reaction

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Strength of Materials
The weight of a body is due to

gravitational force of attraction towards the centre of the earth.
centripetal force of earth
gravitational pull exerted by the earth
force of attraction experienced by par-ticles

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