Strength of Materials
Limiting force of friction is the

Ratio of limiting friction and normal reaction
Tangent of angle between normal reaction and the resultant of normal reaction and 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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Strength of Materials
In actual machines

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

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Strength of Materials
In the equation of virtual work, following force is neglected

reaction of a rough surface of a body which rolls on it without slipping
All of the listed here
reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
reaction of any smooth surface with which the body is in contact

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