Strength of Materials
The weight of a body is due to

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

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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 meet in a point & the lines of action of these forces are parallel
these forces are equal
the lines of action of these forces are parallel
the lines of action of these forces meet in a point

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Strength of Materials
Center of percussion is

the point of C.G.
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

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