IP Physics Notes (Upper Secondary, Year 3-4): 1) Physical Quantities, Units & Measurements
In one line
Every measurement needs a number, a unit, and a sensible precision.
Key points
- Convert units by writing the conversion fraction, canceling units, and only rounding at the end.
- In experiments, reduce random error with repeats and fix systematic error by finding the cause, such as zero error or parallax.
Last updated 30 Nov 2025
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Read in layers
1 second
Read the summary above.
10 seconds
Scan the first few sections below.
100 seconds
Jump into the section that matches your decision.
- Start Here
- Quick measurement map
- Concrete example: unit conversion without guessing
- Base & Derived Quantities
Q: What does IP Physics Notes (Upper Secondary, Year 3-4): 1) Physical Quantities, Units & Measurements cover?
A: Base quantities, prefixes, conversion strategies, and lab skills for IP Year 3 measurement questions.
TL;DR Every measurement needs a number, a unit, and a sensible precision. Convert units by writing the conversion fraction, canceling units, and only rounding at the end. In experiments, reduce random error with repeats and fix systematic error by finding the cause, such as zero error or parallax.
Start Here
| Read time | What to take away |
| 1 second | A useful measurement has a number, unit, and honest precision. |
| 10 seconds | Convert units by cancelling units, not by guessing decimal moves. Reduce random error with repeats, and fix systematic error by finding the biased source. |
| 100 seconds | Use the measurement map and conversion example to practise reading instruments, choosing significant figures, spotting zero or parallax error, and checking dimensions. |
Quick recap -- Every measurement must carry a magnitude, a unit, and an honest statement about precision. Know your SI base units, keep prefixes on autopilot, eliminate zero/parallax errors, and present data with significant figures that match your apparatus.
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These notes align with SEAB GCE O-Level Physics (6091) content used in IP programmes (exams from 2026).
Status: SEAB O-Level Physics 6091 syllabus (exams from 2026) checked 2025-11-30 - scope unchanged; remains the reference for these notes.
