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

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

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Strength of Materials
Limiting force of friction is the

Ratio of limiting friction and normal reaction
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 limiting friction

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