Strength of Materials
Frictional force encountered after commencement of motion is called

frictional resistance
limiting friction
post friction
dynamic friction

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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
remain horizontal
slant down towards direction of pull
unpredictable

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Strength of Materials
The weight of a body is due to

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

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