Applied Mechanics and Graphic Statics
A ladder of weight 'w' rests against a smooth vertical wall, and rests on rough horizontal ground, the coefficient of friction between the ladder and the ground being 1/4. The maximum angle of inclination of the ladder to the vertical, if a man of weight 'w' is to walk to the top of it safely, is tan'1 x, where x is

4
3
1/3
1/4

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Applied Mechanics and Graphic Statics
A point subjected to a number of forces will be in equilibrium, if

Two resolved parts in any two directions at right angles are equal
Algebraic sum of the moments of the forces about the point is zero
Algebraic sum of the forces is zero
Sum of resolved parts in any two directions at right angles, are both zero

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Applied Mechanics and Graphic Statics
Newton’s Law of Motion is:

All listed here
To every action, there is always an equal and opposite reaction
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
Everybody continues in its state of rest or of uniform motion in a straight line, unless it is acted upon by some external force

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Applied Mechanics and Graphic Statics
The following is not a law of static friction:

The force of friction depends upon the roughness of the surface
The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces
The force of friction always acts in a direction opposite to that in which the body tends to move
The force of friction is dependent upon the area of contact

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