Strength of Materials
The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of

kinematic friction
friction
repose
limiting friction

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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 meet in a point & 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 are parallel

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