Charlie.

This week we did Aleks & we have been doing stuff with vectors.
vectors have a magnitude and a directions.
to add vectors you add head to the tail.
the triangle formed by the vectors give the resultant vector.
to add vectors algebraically you add components.
to find the magnitude > square root of x^2 + y^2
magnitude is done a|^->|
scalar multiplication puts a scalar times each component.
geometric representation = picture.
head ----tail
.________>


Example:
.__> A
.
|
|
|
|
\/ B

~~A+B =
.__>
|
|
|
|
\/

~~2A + 1/2B
.__.__>
|
|
\/