Engineering Mechanics
In order to determine the effects of a force, acting on a body, we must know

Line of action of the force
Magnitude of the force
Nature of the force i.e. whether the force is push or pull
All of these

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Engineering Mechanics
According to Newton's first law of motion,

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
None of these
To every action, there is always an equal and opposite reaction

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Engineering Mechanics
Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then

Their algebraic sum is zero
Their lines of action are at equal distances
The algebraic sum of their moments about any point in their plane is zero
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

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