Strength of Materials
In actual machines

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

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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
Ratio of limiting friction and normal reaction
Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction

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

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

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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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