Vectors

Vector

• Equal Vector, Negative Vector, Parallel Vector, Free Vector (Fixed Vector & Position Vector)

Free vector:

Vectors in which there is no restriction to choose the origin of a vector.

Position (vector)

In geometry, a position or position vector, also known as location vector or radius vector, is a Euclidean vector which represents the position of a point P in space in relation to an arbitrary reference origin O. Usually denoted s or r, it corresponds to the displacement from O to P.

http://emweb.unl.edu/math/mathweb/vectors/vectors.html 

Vectors and vector addition:

Addition of two vectors is accomplished by laying the vectors head to tail in sequence to create a triangle such as is shown in the figure.

A vector can be resolved along any two directions in a plane containing it. The figure shows how the parallelogram rule is used to construct vectors a and b that add up to c.