3.1 — Scalars and vectors

Physics deals with two kinds of quantities — scalars and vectors. The distinction is simple, but its consequences are deep: from notation, to how you…

3.3 — Components and unit vectors

The graphical method (§3.2) is fine but doesn’t scale. Components are the algebraic tool that makes vector work scalable — 100 vectors as easy as 2.…

3.4 — Adding vectors by components

With the components tool from §3.3, vector addition reduces to simple scalar addition per axis. More accurate than graphical and scalable to many vectors.