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

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

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces are parallel
these forces are equal
the lines of action of these forces meet in a point & the lines of action of these forces are parallel
the lines of action of these forces meet in a point

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

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