We Shouldn’t Avoid the Unit Vector in Introductory Physics

Photo: Rhett Allain. Unit Vectors

There is a problem with many of the algebra-based physics textbooks (and courses) — they avoid unit vectors and maybe they shouldn’t.

Oh, what is a unit vector? How about I start with a physics problem so you can see why we need unit vectors. Don’t worry, I’m going to still give my full explanation of unit vectors.