Strength of Materials
The center of gravity of a triangle lies at the point of

Intersection of bisector of angles
Intersection of diagonals
Concurrence of the medians
Intersection of its altitudes

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Strength of Materials
The weight of a body is due to

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

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Strength of Materials
According to principle of moments

positive and negative couples can be balanced
if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
if a system of coplanar forces is in equilibrium, then their algebraic sum is zero

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