Strength of Materials
Pick up wrong statement about friction force for dry surfaces. Friction force is

proportional to velocity of sliding
proportional to normal load between the surfaces
dependent on the materials of contact surface
independent of the area of contact surfaces

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

these forces are equal
the lines of action of these forces are parallel
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
Which one of the following statements is not correct

the tangent of the angle of repose is equal to coefficient of friction
the tangent of the angle of friction is equal to coefficient of friction
the angle of repose is equal to angle of friction
the sine of the angle of repose is equal to coefficient to friction

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