IGCSE · 26 September 2026 · 7 min read
Is IGCSE Physics hard? Find the skill making it difficult
Understanding an example while a teacher solves it is different from choosing a method on a blank page. That gap explains why Physics can feel manageable in class and unexpectedly hard in an exam. The response should be to practise the missing decision, not simply reread more pages.
The following checks apply broadly to Cambridge and Edexcel IGCSE Physics. They are original diagnostic examples, not a mock exam, predicted paper or grade calculator. Your board and route still determine the exact content and assessment you must prepare for.
The difficult part is often moving between representations
A question may describe a trolley in words, show its motion on a graph and ask for a force. You need to connect the story, the graph and an equation. Memorising separate definitions does not automatically build that connection. A good first move is to name the quantity being asked for and identify what the information can tell you.
For example, a horizontal section on a velocity–time graph means constant velocity. Its gradient is zero, so acceleration is zero and the resultant force is zero. This does not say there are no forces: a forward driving force could balance a resistive force. One short chain links the graph to the model and then to the explanation.
Readiness check 1: maths and units
A small motor transfers 1800 J in 2.0 minutes. Find its average power. Try it before continuing. Convert the time first: 2.0 minutes = 120 s. Then P = E / t = 1800 / 120 = 15 W. An answer of 900 W suggests you used minutes as seconds; 216000 suggests you multiplied energy by time instead of dividing.
Now change the question: the same energy is transferred at an average power of 30 W. The time is t = E / P = 1800 / 30 = 60 s. If the first version was comfortable but the second was not, practise rearranging relationships. If both equations were clear but the units caused trouble, work on conversions. These are different repair tasks.
Readiness check 2: physical reasoning
A book rests on a table. Explain why it does not accelerate. The book has a downward gravitational force and an upward contact force; these balance, so the resultant force on the book is zero. 'Gravity stops acting' is incorrect. 'It has no energy' does not answer the force question. 'The forces balance' needs the relevant forces identified when the task requires an explanation.
Next imagine the same book travelling in a straight line at constant velocity. The resultant force is still zero. This changed situation tests whether you understand the principle or have memorised a sentence about stationary objects. Practise this kind of comparison: change one condition, predict the effect and explain what remains the same.
Readiness check 3: graphs and evidence
A distance–time graph rises in a straight line from 2 m at 1 s to 14 m at 5 s. The speed is the gradient: change in distance / change in time = (14 − 2) / (5 − 1) = 3 m/s. Dividing 14 by 5 uses coordinates relative to the origin rather than the change between the stated points.
For practical work, also ask what was measured and how. A repeated reading can help reveal random variation, but repeating an incorrectly zeroed instrument does not remove its offset. If graph questions feel difficult, separate axis reading, gradient calculation and interpretation. You may be secure in two of those skills and need targeted work on only the third.
Are some topics harder than others?
Electricity can feel abstract because current, voltage and resistance are related but different. Forces can feel confusing when everyday language suggests a moving object must always have a forward resultant force. Waves require careful distinctions between oscillation, wave travel and energy transfer. None of this establishes a universal hardest topic: your own mistakes provide better evidence.
Choose one topic you avoid and complete a short mixed check: define a quantity, interpret a diagram, solve a calculation and explain a changed situation. If only the calculation fails, do not restart every page of the chapter. If the meaning of the quantities is unclear, a worked calculation alone may hide the problem. Repair the earliest broken step.
Match practice to Cambridge, Edexcel linear or modular
The physical principles overlap, but assessment labels are not interchangeable. Cambridge Core and Extended are entry routes. Edexcel linear Paper 1 and Paper 2 are both required for the separate Physics qualification. Edexcel modular Unit 1 and Unit 2 divide the content into assessed units. A paper called '2' does not identify its purpose without the qualification code.
Keep your code at the top of your study checklist and use your current syllabus to confirm coverage. Practise with another board's explanation when it helps you understand an idea, then return to a question appropriate to your own course. Do not diagnose your readiness using advanced material that is outside your syllabus or a paper with a different structure.
Turn the result into a useful next session
Choose the check above that exposed a gap. Spend a short period understanding the correction, then attempt a new version without looking back. For the power example, try 2400 J transferred in 80 s: the answer is 30 W. Explain why doubling the time at fixed energy halves the power. Correct arithmetic and a correct trend together show more than either alone.
Bring repeated or unclear mistakes to a teacher with your original working. Teaching is particularly useful when you cannot tell why a model is appropriate or why an explanation is incomplete. The free revision system can organise independent work; a course adds opportunities for teaching and feedback. Neither requires you to label yourself as naturally good or bad at Physics.
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 I do IGCSE Physics if I am not strong at maths?
You can work on the specific mathematical skills the course needs: rearranging equations, ratios, units and graphs. Use a small diagnostic to identify the problem. Being uncertain about algebra is a reason to practise algebra with feedback, not proof that every Physics topic is out of reach. Your current Maths grade alone does not identify the missing skill.
Is IGCSE Physics harder than Biology or Chemistry?
There is no universal ranking that predicts an individual's experience. Compare actual tasks from the courses available at your school and consider your interest, mathematical confidence and ability to explain ideas. All three sciences require understanding and application; choosing a subject only because someone calls it an easy grade is unreliable.
Why do I understand Physics lessons but struggle with questions?
A lesson supplies prompts that an independent question may remove. Practise identifying the unknown, selecting a model and deciding the first step before reading a solution. Then solve a changed example. If you can follow a solution but cannot explain why its method was chosen, ask for help with that decision rather than memorising the finished working.
What should I revise first if all of IGCSE Physics feels hard?
Start with a short check of units, equation rearrangement, graph reading and basic forces. These skills recur across topics. Select one gap and repair it with an explanation followed by independent questions, while continuing the school course. Ask a teacher to help prioritise if even the starting questions feel inaccessible.