A bound vector is a vector associated with a particular point P is space,
Fig. 1.2. The point P is the point of application of the vector, and the line
passing through P and parallel to the vector is called the line of action of
the vector. The line of action of a vector can be defined also as a hypothetical
infinite straight line collinear with the vector. The point of application
may be represented as the tail, Fig. 1.2(a), or the head of the vector arrow,
Fig. 1.2(b). A free vector is not associated with a particular point P is space.
A transmissible vector is a vector which can be moved along his line of action
without change of meaning.