Applied Mechanics and Graphic Statics
A string of length 90 cm is fastened to two points ‘A’ and ‘B’ at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force ‘P’ is applied to the ring such that it is in equilibrium vertically below ‘B’. The value of ‘P’ is:

60 g
100 g
80 g
40 g

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

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
Two resolved parts in any two directions at right angles are equal

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

To every action, there is always an equal and opposite reaction
All listed here
Everybody continues in its state of rest or of uniform motion in a straight line, unless it is acted upon by some external force
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

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