Strength of Materials
A single force and a couple acting in the same plane upon a rigid body

balance each other
are equivalent
produce moment of a couple
cannot balance each other

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Strength of Materials
Kinetic friction is the

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
Ratio of limiting friction and normal reaction
The friction force acting when the body is just about to move

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