Pearson Edexcel International GCSE Physics · specification 4PH1 · Paper 2 | Whole paper: All content including bold P statements · Free · no account needed
1(a) Units (4PH1 specification)
The units this topic is built on, and the two extra ones the specification reserves for Paper 2.
Learn it on Incandio
The 2 Incandio pages that teach this — each explained in full, then proved in marked questions, taught back to an AI pupil and defended in a debate. Completely free.
- Speed, and What a Distance–Time Graph Is Telling You — Speed as a rate, the units physics insists on, and how to read a journey straight off a graph.
- Momentum — Why a slow lorry is harder to stop than a fast bicycle — and why every safety device ever designed does the same one thing.
The teaching route this belongs to: Topic 1 · Forces and motion (Physics) — the lessons in order, with every gate.
Specification coverage
Topic 1 Forces and motion (a) Units — statements 1.1–1.2P (includes bold P statements assessed on Paper 2 only)
Assessment objectives: AO1, AO2. Suggested learning time: 25 minutes.
Required knowledge
- Use kilogram (kg), metre (m), metre/second (m/s), metre/second² (m/s²), newton (N), second (s) and newton/kilogram (N/kg)
- Bold P statement: use newton metre (N m) and kilogram metre/second (kg m/s)
Required skills
- Quote units correctly in every answer
- Convert between related units before substituting
How it is examined
- Multiple-choice and short-answer recall
- Calculations using the specification's relationships
- Extended open-response applying the physics to an unfamiliar situation
Common mistakes
- Dropping units from a final answer. Unit marks are free and are lost more often than any calculation mark.
- Confusing N/kg (gravitational field strength) with m/s² (acceleration) — numerically equal near Earth's surface, but different quantities.
This page maps the specification. The pages above teach it, and the Physics lessons hold the whole course — completely free.