Vectors

Question 1

AB in terms of a and b?

Answer 1

AB = b - a

a = OA
b = OB

Question 2

When are vectors a and b parallel?

Answer 2

If a = λb an λis constant
When they are scalar multiples

Question 3

How do you find magnitude if a vector; |AB|?

Answer 3

If vector = xi + yj then magnitude is root (x^2 + y^2)
Using Pythagoras

Question 4

What is a unit vector?

Answer 4

â = a/|a|

Question 5

How do you find direction of a vector/ angles with axes?

Answer 5

Draw a diagram, use trigonometry
To find angles between vectors, use sin or cosine rules