Strength of Materials
Dynamic friction as compared to static friction is

less
more
may be less of more depending on nature of surfaces and velocity
same

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Strength of Materials
Coefficient of friction is the

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

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

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