UNIT OVERVIEW

In physics, we need to describe how things move with precision. Some quantities, like temperature, only need a number. Others, like force, also need a direction. This unit teaches you the difference between these two types of quantities and how to work with them.

What you will learn:

• The difference between scalars (magnitude only) and vectors (magnitude and direction)
• How to represent vectors using arrows and signs
• How to add vectors along a straight line
• How to find the resultant — the single vector that replaces several vectors
• Why negative signs show direction, not "bad" values

Why this matters:

When you give someone directions, saying "walk 500 metres" is not enough — you must say which way. The same applies in physics. Understanding vectors helps you solve problems about motion, forces, and more.

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