Hardest A Level Physics Questions & How To Answer Them

Key Takeaways

• The hardest A Level Physics questions typically combine multiple concepts, require several calculation steps, or apply familiar physics to unfamiliar contexts.

• Success comes from methodical problem-solving: read carefully, draw diagrams, identify the physics principles involved, and break complex problems into manageable steps.

• Strategic practice with past papers and mark schemes helps you understand what examiners want and builds confidence with challenging question types.

• Even the hardest questions follow patterns – recognising these patterns through practice makes them significantly more approachable.

If you've looked at an A Level Physics past paper and found certain questions more challenging than others, you're not alone. Every physics student encounters problems that seem impossibly complex at first glance. The good news? These hardest A Level Physics questions aren't designed to catch you out – they're testing whether you can apply what you've learned in situations that require deeper thinking.

With the right strategies and systematic practice, you can develop the skills to tackle them confidently. 

This guide breaks down what makes physics questions difficult and shows you exactly how to approach them.

What Makes an A Level Physics Question 'Hard'?

After nearly three decades teaching physics and marking countless exam papers, I've noticed that difficulty rarely comes from obscure content. Instead, hard questions share specific characteristics that make them demanding.

• Multi-step calculations require you to work through several stages before reaching the final answer. You might need to find an intermediate value like velocity before you can calculate kinetic energy, then use that energy in a conservation equation. Each step depends on the previous one, so an early mistake will carry through your work.

• Cross-topic synthesis asks you to combine concepts from different areas of the specification. A projectile motion question might also involve circular motion, or a circuits problem could include elements of thermal physics. These questions test whether you truly understand how physics concepts connect rather than treating each topic as isolated.

• Unfamiliar contexts present familiar physics in situations you haven't seen before. You know how to use F = ma, but applying it to analyse the force on a satellite in an orbit requires you to think beyond more familiar examples. The physics principles are the same, but you need to work out how to apply them.

• Mathematical demands include algebra, simultaneous equations, trigonometry, graphical analysis, and logarithms. These questions assume good maths skills and won't walk you through the mathematical steps – you're expected to recognise what mathematical operations are needed and execute them correctly.

• Derivation and proof questions ask you to show how equations are derived from fundamental principles. Unlike calculation questions, where you apply given formulas, derivations require you to construct logical arguments, make appropriate substitutions, and manipulate equations to reach a specified result.

• Limited information means the question doesn't explicitly state which equation or principle to use. You need to recognise the physics situation, identify what's relevant, and choose your own approach. This tests genuine understanding rather than pattern recognition.

Understanding these characteristics helps you prepare strategically. When you practice, focus on these aspects rather than relying on set answers to individual questions.

Types of Difficult A Level Physics Questions

Certain question types consistently challenge students across all exam boards. Recognising these patterns helps you target your revision effectively.

Multi-Concept Questions

Multi-concept questions require you to draw on knowledge from different specification areas within a single problem. A particle physics question might involve both energy conservation and relativistic effects. A mechanics problem could combine projectile motion with circular motion and energy transfers.

What makes these challenging is identifying which concepts apply and in what order. You need to recognise the separate physics principles at work, then construct a coherent solution path that addresses each element systematically. The question won't label the different concepts for you – that recognition is part of what's being assessed.

Data Analysis and Practical Questions

These questions present experimental data or describe practical scenarios and ask you to analyse results, calculate uncertainties, evaluate procedures, or suggest improvements. They test whether you understand the principles of scientific investigation, not just theoretical physics.

Students can struggle with these because they require different skills from standard calculations. You might need to process data in tables, recognise sources of systematic or random error, calculate percentage uncertainties, or explain why a particular experimental design is flawed. Examiners want accurate language and a clear understanding of measurement principles.

Derivation Questions

Derivation questions require you to prove or obtain an equation by starting from fundamental principles or other equations you have been given. For example, you might be asked to derive the expression for escape velocity from gravitational field equations, or to show how the microscopic average speed of particles relates to the macroscopic property of pressure in an ideal gas.

These questions are challenging because you can’t rely on simply substituting numbers into a formula. They require a solid grasp of the underlying physics so you can build a clear, logical mathematical argument. Each step must follow naturally from the last, and your working needs to be shown carefully and accurately. The key skills involve identifying useful substitutions and knowing when to rearrange or simplify equations to move the argument forward.

Example Hard Questions & How To Answer Them

Let me walk you through some genuinely challenging questions of the type you'll encounter in A Level exams. I've chosen problems that appear across all exam boards and represent the difficulty level that separates good grades from top grades.

Mechanics Question Example

Question: A projectile is launched from ground level at an angle of 40° to the horizontal with an initial speed of 25 m s⁻¹. At the highest point of its trajectory, the projectile explodes into two fragments of equal mass, along the horizontal. One fragment lands back at the launch point. Calculate the distance from the launch point to where the second fragment lands. (Assume air resistance is negligible and g = 9.81 m s⁻²)

Why it's hard: This combines projectile motion with momentum conservation and energy concepts. You can't just apply SUVAT equations – you need to think about what happens during the explosion and use conservation principles.

Step-by-step approach:

1. Find the horizontal velocity at the highest point

At the highest point, the projectile has only horizontal velocity and vertical velocity is zero. The horizontal velocity remains constant: vₓ = 25 cos(40°) = 19.2 m s⁻¹

2. Determine the time to reach maximum height

Using v = u + at: 0 = 25 sin(40°) – 9.81t, so t = 1.64 s

3. Calculate the range without explosion

Range R = vₓ × total time = 19.2 × (2 × 1.64) = 63.0 m

4. Apply momentum conservation in the horizontal direction during explosion

Before explosion: momentum = m × 19.2 (where m is total mass). After explosion, one fragment (mass m/2) returns to launch point with velocity -19.2 m s⁻¹. For momentum conservation: m × 19.2 = (m/2) × (-19.2) + (m/2) × v₂. Solving: v₂ = 57.6 m s⁻¹

5. Find where second fragment lands

Time to fall from maximum height = 1.64 s. Distance travelled = 57.6 × 1.64 = 94.5 m from explosion point. Since explosion occurs at R/2 = 31.5 m from launch, final distance = 31.5 + 94.5 = 126 m

Common mistakes: 

• Forgetting that the explosion adds energy to the system. 

• Incorrectly applying momentum conservation - which should only be horizontal. 

• Not recognising that the explosion occurs at the midpoint of the original trajectory.

Electricity Question Example

Question: A 220 μF capacitor is charged to a potential difference of 12 V and then discharged through a 47 kΩ resistor. (a) Calculate the initial charge stored on the capacitor. (b) Calculate the time taken for the potential difference across the capacitor to fall to 3.0 V. (c) Calculate the energy dissipated in the resistor during this time.

Why it's hard: This requires understanding exponential decay, using logarithms, and applying energy concepts to capacitor discharge. Many students can handle part (a) but struggle with (b) and (c).

Step-by-step approach:

Part (a): Initial charge

Q₀ = CV = 220 × 10⁻⁶ × 12 = 2.64 × 10⁻³ C = 2.64 mC

Part (b): Time for voltage to fall to 3.0 V

Use V = V₀e^(-t/RC). Here V₀ = 12 V, V = 3.0 V, R = 47 × 10³ Ω, C = 220 × 10⁻⁶ F

3.0 = 12e^(-t/RC)

0.25 = e^(-t/RC)

ln(0.25) = -t/RC

t = -RC ln(0.25) = -(47 × 10³)(220 × 10⁻⁶) ln(0.25) = 14.3 s

Part (c): Energy dissipated

Initial energy: E₀ = ½CV₀² = ½ × 220 × 10⁻⁶ × 12² = 0.0158 J

Final energy: E = ½CV² = ½ × 220 × 10⁻⁶ × 3.0² = 9.90 × 10⁻⁴ J

Energy dissipated = E₀ – E = 0.0158 – 0.00099 = 0.0148 J = 14.8 mJ

Common mistakes: 

• Using an incorrect form of the exponential equation. 

• Making errors with logarithms or signs. 

• Forgetting to square the voltage in energy calculations. 

• Incorrect unit conversion between μF and F.

Fields Question Example

Question: A satellite of mass 850 kg orbits Earth at a height of 420 km above the surface. (a) Show that the orbital speed of the satellite is approximately 7.7 km s⁻¹. (b) Calculate the time period of the satellite's orbit. (c) The satellite's orbit gradually decays due to atmospheric drag. Explain what happens to the satellite's speed and kinetic energy as it moves to a lower orbit. (Earth's radius = 6.37 × 10⁶ m, Earth's mass = 5.97 × 10²⁴ kg, G = 6.67 × 10⁻¹¹ N m² kg⁻²)

Why it's hard: Part (a) requires deriving orbital speed from first principles. Part (c) demands conceptual understanding that challenges intuition – many students incorrectly think speed decreases as the satellite loses energy.

Step-by-step approach:

Part (a): Deriving orbital speed

For circular orbit, gravitational force provides centripetal force:

GMm/r² = mv²/r

v² = GM/r

Orbital radius r = 6.37 × 10⁶ + 4.20 × 10⁵ = 6.79 × 10⁶ m

v = √(GM/r) = √[(6.67 × 10⁻¹¹ × 5.97 × 10²⁴)/(6.79 × 10⁶)] = 7660 m s⁻¹ ≈ 7.7 km s⁻¹

Part (b): Time period

T = 2πr/v = (2π × 6.79 × 10⁶)/7660 = 5570 s = 92.8 minutes

Part (c): Speed and kinetic energy as orbit decays

As the satellite moves to a lower orbit, its gravitational potential energy becomes more negative (decreases in value). The total kinetic energy decreases due to work done against drag. From v² = GM/r, we see that as r decreases, v must increase – the satellite speeds up. Its kinetic energy increases even though total energy decreases. This is counterintuitive but correct: the satellite loses gravitational potential energy faster than it gains kinetic energy, with the difference dissipated as heat through atmospheric drag.

As the satellite moves to a lower orbit, its gravitational potential energy becomes more negative (decreases in value). Atmospheric drag removes energy from the total energy store from the satellite’s orbit. The satellite moves to a lower orbit. From v² = GM/r, as the orbital radius r decreases, the orbital speed v increases. Therefore, the satellite speeds up and its kinetic energy increases.

However, the decrease in gravitational potential energy is greater than the increase in kinetic energy, so the satellite’s total energy decreases. The difference is dissipated as thermal energy, heating the atmosphere.

Common mistakes: 

• Forgetting to add Earth's radius to the orbital height. 

• Using the satellite's mass in calculations when it cancels out. 

• In part (c), incorrectly reasoning that energy dissipation means slowing down.

Strategies for Tackling Hard A Level Physics Questions

Developing a systematic approach to challenging questions matters more than memorising solutions. These strategies work across all question types and exam boards.

Read the Question Carefully and Identify What's Being Asked

Read the question at least twice before writing anything. On your first read, get the overall picture. On your second read, underline or highlight the key information: numerical values, what you're asked to find, any constraints or conditions mentioned.

Look for command words. 'Calculate' means show your working and arrive at a numerical answer. 'Explain' requires you to give reasons. 'Show that' means you need to demonstrate how a given answer is reached. 'Derive' asks you to develop an equation from fundamental principles.

I've seen students lose marks because they answered a different question from what was asked. If the question says 'explain why the current decreases', writing out a calculation without explanation won't likely score well, even if your numbers are correct.

Draw Diagrams and Label All Information

A clear diagram translates complex questions into manageable problems. Even if the question includes a diagram, redraw it yourself and add the information you extract from the text. Keep diagrams simple. Label all known values, mark angles, indicate directions of forces or velocities, and identify what you need to find.

For example, for mechanics problems, draw free body diagrams showing all forces. For circuits, sketch the circuit even if it's described in words. For fields, draw field lines and indicate directions. The act of drawing (or modelling) supports you to think about the physics and often reveals relationships you might otherwise miss.

Break Down Multi-Step Problems

When facing a question with multiple parts, identify the logical sequence of steps needed. 

Ask yourself: 

• what do I need to find? 

• what information do I have? 

• what intermediate values do I need to calculate first?

Write down each step clearly. If you need to find final velocity but don't have acceleration, recognise you'll need to find acceleration first. If you need a value for energy transferred but only have force, you might need to calculate work done. Making these intermediate goals explicit helps you construct a path to the answer.

Avoid trying to do everything in one step. Break it into logical stages, check each stage makes physical sense, then move to the next. This also makes it easier for you to spot errors and easier for examiners to award partial marks if you make a mistake.

Practise Under Timed Conditions

Working through hard questions untimed is useful for learning, but you also need exam-realistic practice. Set yourself specific time limits based on mark allocation – roughly 1-1.5 minutes per mark. A 6-mark question should take about 8-9 minutes maximum.

This teaches you when to move on. If you're stuck on a difficult question, come back to it later rather than using up time that could earn you marks elsewhere. Time pressure also encourages you to work more efficiently, which reveals gaps in your understanding that you can address in further study.

How to Prepare for Hard A Level Physics Questions

Strategic preparation builds the skills and confidence you need to handle difficult questions when they appear in your exam.

Use Past Papers Strategically

Avoid doing past papers chronologically from start to finish. Instead, identify the question types you find hardest and create focused practice sessions around them.A good place to gather these is through past paper collections such as this one: A Level Physics Past Papers. If you struggle with capacitor discharge, work through every capacitor question from the past five years in one sitting.

This concentrated practice helps you recognise patterns in how these questions are structured. You'll start to see that apparently different questions often use similar approaches. The orbital mechanics question above follows the same basic pattern as most circular motion problems – identify the force providing centripetal acceleration, set up the equation, and solve.

Understand Mark Schemes

Mark schemes reveal exactly what examiners want to see. After attempting a question, study the mark scheme carefully. Notice which steps earn marks and what specific points examiners expect.

Mark schemes often award marks for method, even if your final answer is incorrect. They'll indicate 'ECF' (error carried forward), where you can earn later marks despite an earlier mistake. Understanding this helps you see the value of showing all your working clearly and following logical steps.

Pay attention to the level of detail required. Some marks are for stating principles, others for calculations, and others for explanations. Notice the precise wording that earns marks – this helps you develop exam technique.

For long-answer questions (worth 5 marks or more), familiarise yourself with the mark scheme format. These questions typically require extended responses that may draw upon a single topic in depth or cover multiple physics topics. You could be asked to recall, analyse and discuss an investigation or experiment you’re familiar with - often linking to the core practicals you’ve covered during your course. The mark scheme will have multiple marking points, so practice identifying which points you’ve addressed and which you’ve missed - always linking it back to the question. This develops writing comprehensive answers under exam conditions.  

Build Your Formula Recall

While data sheets provide many equations, you need to know which equation applies to which situation and how to manipulate them. Familiarise yourself with your exam board’s formula sheet organised by topic and practise recalling which formulas connect which quantities.

More importantly, understand where formulas come from. If you know that kinetic energy derives from work done (force × distance) and that force relates to acceleration, you can reconstruct connections between these relationships even if you temporarily forget the exact form.

Some critical equations aren't on data sheets. For AQA, OCR, and Edexcel, check your specification to identify which formulas you must memorise. These typically include fundamental definitions and key relationships that examiners expect you to know.

Work Through Worked Examples

Studying detailed solutions to hard problems teaches you problem-solving techniques. Don't just read through worked examples passively. Cover the solution, attempt the question yourself, then compare your approach with the model answer.

Notice how expert solutions are structured: they identify the relevant physics principle, select appropriate equations, show substitution of values clearly, and include units throughout. Adopt these practices in your own work.

For additional practice and structured support, Save My Exams provides comprehensive A Level Physics exam questions organised by topic, along with A Level Physics notes that break down complex concepts systematically.

Frequently Asked Questions

Do I need to answer the hardest questions first in the exam?

No. Start with questions you find most straightforward to build confidence and secure marks quickly. This also ensures you don't run out of time before attempting questions you can definitely answer. 

Tackle the hardest questions once you've collected the accessible marks. If you get stuck on a difficult question, move on and return to it later if time permits. 

Aim to work strategically to maximise your score.

How can I improve my problem-solving skills for physics?

Consistent, focused practice is essential. Work through problems regularly rather than in occasional marathon sessions. 

When you get stuck, don't immediately look at the solution – spend time thinking about what physics principles might apply. Challenge yourself to solve problems in multiple ways when possible. 

Discuss difficult questions with classmates or teachers. Explaining your thinking to others reveals gaps in your understanding. Most importantly, analyse your mistakes thoroughly. Understanding why you got something wrong teaches you more than getting things right.

Are A Level Physics questions getting harder?

Not really. The current specifications emphasise similar skills to previous versions: applying physics concepts, mathematical competency, practical understanding, and analytical thinking. What has changed is the reduction in formulaic questions where you simply plug values into memorised equations. 

More recent papers test whether you can apply physics to unfamiliar situations, which requires deeper understanding. This means fewer 'easy marks' but doesn't necessarily mean papers are harder overall – they just reward different skills. 

Students who understand concepts rather than memorising procedures often find current papers more accessible than older, more calculation-heavy versions.

Final Thoughts

The hardest A Level Physics questions can feel overwhelming when you first encounter them, but they're teaching you something valuable: how to think like a physicist. Every challenging problem you work through builds your ability to analyse unfamiliar situations, connect different concepts, and construct logical solutions.

I've watched countless students transform from feeling intimidated by these questions to approaching them with genuine confidence. The difference wasn't natural ability – it was systematic practice, willingness to learn from mistakes, and developing problem-solving strategies. The questions that seem impossibly hard today will become manageable as you build experience with them.

Focus on understanding rather than memorisation. When you deepen your understanding of how ideas connect and which equations are applicable for a given question, even unfamiliar problems become more manageable. Keep practising, stay curious about the underlying physics, and remember that moments of struggle are a natural and valuable part of learning. 

Challenging questions aren’t meant to catch you out; they’re opportunities to apply your thinking in new ways and to grow in confidence. With persistence and a genuine interest in the concepts, meaningful understanding is completely within reach.