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

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

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Strength of Materials
According to principle of moments

the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
positive and negative couples can be balanced
if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
if a system of coplanar forces is in equilibrium, then their algebraic sum is zero

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Strength of Materials
Limiting force of friction is the

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
Ratio of limiting friction and normal reaction

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Strength of Materials
In actual machines

mechanical advantage is equal to velocity ratio
mechanical advantage is less than velocity ratio
mechanical advantage is greater than velocity ratio
mechanical advantage is unity

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