This document contains generalised information on the basics of vectors for engineering use. This is a year 1 chemical engineering math topic for vectors, but is useful for basic understanding of vector analysis.
Representation of Vectors: Line segments can be used to
represent vectors
a) B b)
→
These both have magnitude
and direction
7
^✗
A
>
α is written as AB and b is written as α
Position vectors of a point C are measured relative to the origin as
represented below:
C
od =
r
>
I
0
, Adding and Subtracting Vectors:
Vectors can be added and subtracted, as represented below.
b
✗
y > >
b a
> 7 >
✗+ b
A parallelogram may be used to represent this addition
✗7 3
This shows us that a + b = b + a
Negative vectors:
When subtracting two vectors, we must notes that a - b = a + (-b)
b
>
Vector - b has equal magnitude to vector b but is
b
g- in the opposite direction.
- Same magnitude
b
ib > - Opposite direction
b^ Tx
a-
> > >
Examples: Position vectors OC and OD, determine the vector CD.
> > >
>
CD OD = OC + CD
>
OÉ ,
therefore,
¥ >
> >
CD = OD - OC
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