Final revision pack

Learning Goals

What students should be able to explain, calculate and investigate after completing Final Revision Pack.

• Identify which unit/formula a mixed exam question is testing from the quantities given.
• Recall the full list of required experiments and their key results.
• Apply graph-reading skills (slope, intercept, area) correctly across all topics.
• Recognise and avoid the most common mistakes seen throughout the course.
• Apply good exam technique: units, significant figures, showing work, and time management.

How to Choose the Right Formula

A method for selecting equations from the quantities, units and conditions given.

Many exam questions are hard not because the physics is difficult, but because it isn't obvious which formula applies. Use this approach:

• Identify every quantity given in the question, with its unit — the unit is often a strong clue to which topic/formula is involved (e.g. Ω m suggests resistivity; kg m⁻³ suggests density; N kg⁻¹ suggests gravitational field strength).
• Identify what the question asks you to find, and check which formula contains both the known quantities and the unknown.
• If more than one formula seems to fit, look for a keyword: 'constant acceleration' → SUVAT; 'constant velocity/no friction' → conservation of energy; 'circular path' → centripetal force; 'changing flux' → Faraday's/Lenz's law.
• If a question gives you unfamiliar units or an unfamiliar context, don't panic — check whether it is really a standard formula in disguise (e.g. a 'new' proportionality question is often just F ∝ a or T² ∝ R³ from a topic you already know).

Investigation Skills Across the Course

A specification-aligned checklist of the investigative experiences and data skills students should develop across all strands.

The 2025 specification is organised around learning outcomes that ask students to investigate, model, verify, analyse primary and secondary data and evaluate evidence. Treat the following as a programme of investigative experience rather than as a list to memorise.

• First classify the task: measurement of an unknown, verification of a relationship, controlled investigation, demonstration, calibration, secondary-data analysis or evidence evaluation.
• State the aim or research question. Give independent, dependent and controlled variables only when the method genuinely changes one factor to test its effect.
• For a measurement, identify every directly measured and known quantity, the calculation used to find the unknown, alignment/zero checks and meaningful repeats.
• For a verification, identify the predicted relationship, the readings and transformed quantities, the required graph, and what its gradient/intercept should mean.
• For secondary-data or source evaluation, state selection criteria, provenance, date, uncertainty and how competing evidence will be weighed.
• Keep raw data, units and observations before calculating averages or transformed quantities; distinguish random variation from systematic effects.
• Give experiment-specific precautions, reliability improvements and safety controls, and state a conclusion limited to the evidence and uncertainty.

Graph Skills Recap

Constructing, analysing and evaluating graphs and datasets across the Physics course.

Top Mistakes Seen Across the Whole Course

Frequent conceptual, mathematical, graphical and experimental errors to avoid.

• Substituting centimetres, grams, minutes or nanometres without first converting to the required units.
• Writing a vector magnitude without its direction.
• Using SUVAT when acceleration is not constant.
• Using Q = mcΔθ during a change of state instead of Q = mL.
• Calling every straight-line V–I result “Ohm’s law” without stating constant temperature.
• Measuring angles from a surface rather than from the normal in reflection and refraction.
• Using orbital altitude where a formula requires distance from the centre of the planet.
• Confusing magnetic field direction with the direction of force on a current or charged particle.
• Drawing a nuclear equation that does not conserve nucleon number and charge.
• Quoting a graph slope without units or physical meaning.
• Describing an investigation without identifying the independent, dependent and controlled variables.
• Listing “human error” instead of identifying a specific limitation and a realistic improvement.

General Exam Technique

A practical method for calculations, explanations, diagrams, data questions and unfamiliar contexts.

• Convert quantities to the units required by the equation before substitution; SI units are normally expected unless the question specifies another unit.
• Write the equation, substitute values clearly and give the final answer with an appropriate unit.
• Keep extra calculator digits during working and round sensibly at the end.
• For vector quantities, state a direction or use a consistent sign convention.

• For an “explain” question, connect the relevant physical principle to the observation or outcome.
• For a graph, label both axes with quantities and units and use the gradient or area only when its physical meaning is established.
• For an experiment, identify what is measured, what is controlled and how the data leads to the stated result.
• Do not rely on claims about what examiners “always” want; follow the wording and marks of the question.

Teacher guidance is labelled as such. Advice derived directly from uploaded official SEC questions or marking material is labelled “Official SEC guidance”.

Full-Course Formula Summary

Principal equations grouped by strand, with the conditions that are most often missed.

Mixed Full-Course Practice Questions

Mixed problems requiring formula selection across several course units.

Attempt each question before revealing the worked answer. The set deliberately mixes direct calculation with method and interpretation.

A Final Note on OL vs HL

How the 2025 specification distinguishes Ordinary Level and Higher Level learning and assessment.

In the official specification, Ordinary Level students study learning outcomes shown in normal type. Higher Level students study all learning outcomes, including those printed in bold. The difference is therefore not simply “easy calculations at OL and difficult calculations at HL”. Both levels include explanation, evidence, data and application.

Using this site: begin with the core explanation, definitions and direct applications. Lessons labelled Higher Level add the outcomes and depth required at HL. A teacher should always compare the lesson with the official learning outcome rather than relying only on a difficulty label.

Final Test Checklist

A final check for units, conditions, direction, working and presentation before submitting an answer.

Before submitting any calculation or diagram answer, run through this quick checklist:

• Write the relationship you are using before substituting values.
• Convert every quantity to the required SI unit.
• Show the substitution and enough working for the method to be followed.
• Include the correct unit with the final answer.
• For vector quantities, state the required direction as well as the magnitude.
• Check that the answer is physically reasonable and that rounding has not been introduced too early.
• Label diagrams clearly and include arrows where direction matters.
• Re-read the question and confirm that every part has been answered.