Components of Two Dimensional Vectors in the x and y directions
Drag point A or B.
Vector u will be the vector connecting A & B.
It is made up of component in the x direction ->
and the y components ^
A good reference on introduction to vectors
An Introduction to Vectors (GCSE Stage: 4 and 5), Toni Beardon, June 2004,February 2011, NRICH Article