Exam technique · 25 June 2026 · 4 min read
What examiners actually look for: trigger words in physics mark schemes
Updated 25 September 2026
Whether “the particles move faster” or “their average kinetic energy increases” answers a question depends on what was asked. Scientific terms help when they express the required idea precisely; neither phrase is a universal answer.
Use mark schemes to learn the distinctions that matter: mass and weight, speed and velocity, energy and power. Cambridge’s published principles explicitly require keywords to be used scientifically and in context; the presence of a word alone is insufficient.
Why mark schemes work this way
Thousands of scripts must be marked identically, so examiners are given objective criteria: award the mark if the answer contains this idea, expressed with this precision. Words like 'increases', 'per unit', 'rate of', 'average', and 'resultant' are not decoration — they are frequently the difference between the mark and nothing.
The families of trigger words
Definition questions demand the precise formula in words: density is mass per unit volume — 'how heavy something is for its size' scores zero. Explanation questions demand causal chains with named quantities. Comparison questions demand both sides stated explicitly: not 'copper is better', but 'copper has a lower resistivity than iron, so the current is larger for the same potential difference'.
Students trained this way describe exam questions as familiar before they finish reading them. Ahmed in Dubai called it 'revealing exactly what examiners are looking for in every answer' — which is precisely what studying mark schemes does.
Learn what the scientific terms mean, then use them in the right context.
How to build your own trigger-word bank
Attempt a question before opening its mark scheme. Compare the scientific ideas in your answer with the award criteria and any allowed alternatives. Record useful terms with their meanings and a worked context, then test yourself on another question. Avoid copying an answer into a different situation without checking that it applies.
Questions, explained
Choose a question for a direct answer, then explore the explanation and supporting resources. Each answer has its own link to save or share.
Can a Physics answer earn marks if it uses my own words?
Yes, an answer can use different wording when it communicates the required scientific meaning accurately. Some technical terms or definitions need particular precision, but matching a remembered sentence is not a universal marking rule. Check the specific question and its published marking guidance.
For example, saying 'a larger resultant force produces a larger acceleration for the same mass' communicates the relationship in F = ma. Saying only 'more force means more motion' leaves both the type of force and the change in motion unclear. When checking your answer, compare ideas and conditions, not just identical words. Ask a teacher about an alternative explanation if the short mark scheme does not make its acceptability clear.
Why does confusing energy and power lose the meaning of an answer?
Energy describes an amount transferred or stored; power describes the rate of energy transfer. A device can transfer the same energy as another device while taking longer and therefore operating at lower average power. Use joules for energy and watts for power.
Two motors each lift a load by increasing its gravitational potential energy by 600 J. One takes 3 s and the other 6 s. Their average useful powers are 600/3 = 200 W and 600/6 = 100 W. Neither the shared energy transfer nor the different power tells you the total electrical input without more information. Distinguishing the quantities prevents a precise-looking calculation from answering the wrong question.
Should I include several possible explanations to improve my chance of a mark?
Select the explanation supported by the question rather than adding incompatible alternatives. Contradictory statements can make your reasoning unclear or incorrect. Check that later sentences preserve the conditions you used earlier, especially whether current, voltage, temperature or speed is held constant.
For a resistor with constant resistance, a larger potential difference produces a larger current. A filament lamp whose temperature rises does not keep the same resistance. Mixing those two models in one answer creates a contradiction. Before writing, identify the component and what is allowed to change. After writing, read the answer as a single argument, looking for any statement that undermines the next one.
Sources and specifications
- Cambridge IGCSE Physics 0625 syllabus, 2026–2028
- Pearson Edexcel International GCSE Physics: specification and assessment materials
- Cambridge published marking principles, including scientific meaning and alternative wording
- Pearson Edexcel 4PH1 Paper 2P mark scheme, June 2023: marking guidance and accepted alternatives