Topic 1 · pp. 6–7 · Free
Topic Notes · Easy summaries with diagrams
Chapter 1 — Chapter 1 — Physical Quantities and Measurements
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📘Easy summary
Quantities that can be measured directly or indirectly with instruments (length with a ruler, time with a clock, temperature with a thermometer) are physical quantities; the laws of physics are expressed through them. Non-physical quantities (love, fear, wisdom, beauty) cannot be measured by instruments; they depend on the observer's perception and are compared qualitatively using criteria, indices or surveys.
⭐Key points
- Physical: measurable, instrument used, number + unit.
- Non-physical: not measurable, help analyse behaviour, emotions, social interactions.
- Colour is treated as a non-physical quantity (MCQ 1.4).
🔬Diagram
🌿Real-life example
Body temperature 37 °C (physical) vs happiness (non-physical).
💡Exam tip
- Answer 'Can a non-physical quantity be measured?' with surveys/indices.
✅Quick check
1. Non-physical quantity:
2. A physical quantity has:
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