P4.7.2 - Magnitude of a vector

Magnitude of a vector.; Students should be able to find a unit vector in the direction of a, and be familiar with | a |.

Use magnitude of a vector to connect the rule to the data and decision in the question.

This matters because magnitude of a vector determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply magnitude of a vector to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: Magnitude of a vector is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.