Position & Displacement Vectors (Edexcel IGCSE Maths A (Modular))

Position & Displacement Vectors

What are position vectors?

• A position vector describes where a specific point, A , is, relative to a fixed origin, O

  • Lower-case bold (or underlined) letters are used

    • The point A  has position vector a =   

• Their components are equal to their coordinates

  • The point with coordinates (3, -2) has position vector from the origin

What are displacement vectors?

• A displacement vector describes the direction and distance between two points

  • The displacement vector from A  to B  is 

    • How to get from A  to B

• If the points A  and B  have position vectors a and b relative to O 

  • then A  to B  is the same as A  to O  (-a) followed by O  to B  (b)

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    • This is a useful rule to remember