1.1.4 — Understand that a scalar quantity has magnitude (size) only and that a vector quantity has magnitude and direction

Scalar quantities

Have magnitude only (size).

Example: “10 m” — just a length, no direction.

Vector quantities

Have magnitude AND direction.

Example: “10 m east” — the direction changes the meaning completely.

Real-world example:

A weather report giving wind speed only is incomplete — wind direction is crucial for pilots and sailors.