Strength of Materials
Kinetic friction is the

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

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Strength of Materials
The weight of a body is due to

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

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