An elementary introduction to the use of vector and vector addition, in graphic form (head-to-tail) or by resolving into components. ... This lesson plan supplements: "Vectors," section #14 . ... To resolve vectors into components along the directions of given axes, in two or three dimensions. ... Today we discuss vectors , mathematical objects which have not only a magnitude , a size, the way ordinary numbers have, but also a direction in which they point. ... When do vectors add like numbers? ...