Strength of Materials
The weight of a body is due to

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

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Strength of Materials
A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

slant up towards direction of pull
unpredictable
slant down towards direction of pull
remain horizontal

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