Strength of Materials
Coefficient of friction is the

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

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Strength of Materials
The weight of a body is due to

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

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