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

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Strength of Materials
Kinetic friction is the

Ratio of limiting friction and normal reaction
Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
The friction force acting when the body is just about to move
The friction force acting when the body is in motion

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