Quantities and Measurement
Learn the complete H1 Physics 8867 Quantities and Measurement scope through clear explanations, worked methods and purposeful practice.
Learning goals
- Use SI quantities, units, prefixes and dimensional analysis.
- Estimate physical quantities and check the reasonableness of results.
- Assess random, systematic and propagated uncertainties.
- Resolve, add and subtract coplanar vectors.
Before you begin
Start with the first lesson if this topic is new. If you are revising, use Check your understanding to find the lesson that deserves your attention, then work from the explanation to supported and independent practice.
How the ideas connect
- SI units, prefixes and homogeneity
- Estimation, errors and uncertainty
- Scalars and coplanar vectors
Learn in order
Lesson route
Learn the topic
- 01SI units, prefixes and homogeneityUnits are part of the physics, not decoration added after a calculation. They help you convert data, build derived quantities and reject equations that cannot be correct.35 min
- 02Estimation, errors and uncertaintyGood measurement is about the quality of the evidence, not the number of decimal places. Separate scatter from bias, then carry the uncertainty through the calculation.35 min
- 03Scalars and coplanar vectorsA vector needs both magnitude and direction. Components let you replace a sloping vector by two signed perpendicular parts that are easier to combine.35 min
Check your understanding
Practice and check
What you will learn
These lessons cover the complete H1 Quantities and Measurement scope in a deliberate order.
- Recall the six SI base quantities used in H1 Physics and their units.
- Convert prefixes safely and express derived units in base units.
- Make defensible order-of-magnitude estimates.
- Distinguish precision, accuracy, random error and systematic error.
- Distinguish scalars from vectors using examples.
- Add and subtract coplanar vectors graphically or by components.
Syllabus and review details
Covers the complete 2027 H1 Physics 8867 requirements for Quantities and Measurement; H2-only extensions are deliberately left out.
Use written working, labelled diagrams and clear physical reasoning as well as final answers. The lesson questions are designed to prepare you for both calculations and explanations.
Curriculum and content checked 2026-09-14
Frequently asked questions
Where should I start in Quantities and Measurement?
Start with SI units, prefixes and homogeneity. The 3 lessons build in order, and each one ends with an independent question and a clear next step.
How should I use the worked examples?
Cover the steps, attempt the question first, then compare your method line by line. Check the sign, direction, unit and size of your result.
What should I do when I finish the lessons?
Use Check your understanding, revisit any weak lesson, then complete the practice plan without looking at the worked answers.
Course and syllabus information
- Course
- GCE A-Level H1 Physics
- Edition
- GCE A-Level H1 Physics 2027