Strength of Materials
Two coplanar couples having equal and opposite moments

Balance each other
Are equivalent
Produce a couple and an unbalanced force
Produce a moment of couple

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Strength of Materials
Coefficient of friction is the

the friction force acting when the body is in motion
ratio of limiting friction and normal reaction
the friction force acting when the body is just about to move
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.
gravitational pull exerted by the earth
force of attraction experienced by par-ticles
centripetal force of earth

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