Strength of Materials
Pick up wrong statement about friction force for dry surfaces. Friction force is

dependent on the materials of contact surface
proportional to normal load between the surfaces
proportional to velocity of sliding
independent of the area of contact surfaces

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Strength of Materials
Coefficient of friction is the

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

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Strength of Materials
The weight of a body is due to

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

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