Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces are parallel
the lines of action of these forces meet in a point & the lines of action of these forces are parallel
these forces are equal
the lines of action of these forces meet in a point

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Strength of Materials
In actual machines

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

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Strength of Materials
Kinetic friction is the

Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
The friction force acting when the body is in motion
The friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction

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