Key quantities, symbols and units

Use the syllabus conventions for base quantities and common physical quantities, including usual symbols and units for mechanics, waves, electricity, fields, thermal physics, quantum/nuclear physics, medical physics and astronomy.

Use q.1-base quantities, symbols and si units to connect the rule to the data and decision in the question.

This matters because q.1-base quantities, symbols and si units determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply q.1-base quantities, symbols and si units to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: Q.1-Base quantities, symbols and SI units is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.

Interpret and write physical quantities with appropriate symbols, prefixes, derived units and dimensions, and distinguish quantities that use similar symbols in different contexts.

Use q.2-quantity notation and unit interpretation in answers to connect the rule to the data and decision in the question.

This matters because q.2-quantity notation and unit interpretation in answers determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply q.2-quantity notation and unit interpretation in answers to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: Q.2-Quantity notation and unit interpretation in answers is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.