Vectors Flashcards
1
Q
AB in terms of a and b?
A
AB = b - a
a = OA
b = OB
2
Q
When are vectors a and b parallel?
A
If a = λb an λis constant
When they are scalar multiples
3
Q
How do you find magnitude if a vector; |AB|?
A
If vector = xi + yj then magnitude is root (x^2 + y^2)
Using Pythagoras
4
Q
What is a unit vector?
A
â = a/|a|
5
Q
How do you find direction of a vector/ angles with axes?
A
Draw a diagram, use trigonometry
To find angles between vectors, use sin or cosine rules
