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

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

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Strength of Materials
Kinetic 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
Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
Ratio of limiting friction and normal reaction

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