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
In actual machines

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

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Strength of Materials
Kinetic 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 the limiting friction

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Strength of Materials
According to principle of transmissibility of forces, the effect of a force upon a body is

The same at every point in its line of action
Maximum when it acts at the center of gravity of a body
Minimum when it acts at the C.G. of the body
Different at different points in its line of action

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