Strength of Materials
In actual machines

mechanical advantage is unity
mechanical advantage is equal to velocity ratio
mechanical advantage is greater than 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
Ratio of limiting friction and normal reaction
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

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

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

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