# Vectors

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A force acting on a body has a magnitude and a direction. Vectors describe the direction of a force along a two or three dimensional axis. If more than one force act on a body, the resultant direction of the force is obtained through vector addition.

For instant, consider two vectors **a** and **b**. The resultant vector **r** is obtained by the following operation:

a = <3,0,-9>

b = <-2,-5,10>

a + b = r = <3+(-2),1+(-5),-9+10> = <1,-4,1>

The resultant vector will now have the coordinates <1,-4,1> in a three dimensional Cartesian coordinate system.