IB Physics How to Read a Physics Question
Most marks in IB Physics are not lost because a student cannot do the maths. They are lost in the first ten seconds, when the question is misread. This guide shows you how to break a difficult-looking question into smaller, manageable parts.
- What is given
- What is required
- Which Physics concept applies
- Which equation or principle is relevant
- How to check the final answer
Why understanding Physics is not enough
If you have ever said, “I understood it in class but got it wrong in the test,” you have met the real problem. IB Physics how to read a physics question is a skill of its own. Classroom teaching builds understanding of topics. Exam questions ask you to interpret an unfamiliar situation, decide what matters and respond in the form the examiner expects.
Learning how to read IB Physics questions carefully fixes problems that extra formula practice does not. Here is what we most often see:
Formula first, thinking later
The student sees numbers and grabs the nearest equation before understanding the situation.
Answering a different question
They calculate speed when the question wanted kinetic energy, or give a number when an explanation was required.
Unfamiliar context, familiar idea
A spacecraft, a roller coaster or a lab setup looks new, but the Physics underneath is something already taught.
For the official syllabus and assessment information, always refer to the International Baccalaureate website. Your school's current subject guide is the final authority.
IB Physics how to read a physics question: the 10-step method
Use these steps on every IB Physics exam question, even the ones that look easy. With practice they take under a minute.
Read the question completely
Read from the first word to the last, including any diagram, table and units in the stem. Do not jump to a formula after spotting a number. Early sentences often set conditions (“from rest”, “constant speed”, “ignore air resistance”) that decide which equations are valid.
Identify the command term
Words like calculate, determine, state, describe, explain, compare, suggest and estimate tell you the type and depth of answer wanted. “State” needs one line. “Explain” needs a reason. Circle it before doing anything else.
Identify exactly what is being asked
Separate four things: what is given, what is required, what must be calculated and what must be explained. Write the target quantity with its symbol, for example “find F (N)”.
Extract the important information
Pull out numerical values, variables, units, conditions and relationships. Cross out or ignore anything unnecessary. Questions often include extra data deliberately, and not every number belongs in the answer.
Identify the Physics concept
Ask, “What Physics idea is this question testing?” Is it forces and Newton's laws, energy conservation, momentum, wave behaviour, electric circuits, fields, thermal physics, circular motion, or uncertainty and data analysis? Naming the topic narrows your choices immediately.
Choose the correct equation or principle
Choose a relationship because it matches the physical situation, not because you remember it. Ask whether the conditions behind the equation hold here (for instance, constant acceleration for the suvat equations) and whether it links your given and required quantities.
Check units
Convert to SI before substituting (km/h to m/s, g to kg, cm to m). Then check that the units on both sides of your rearranged equation agree. Unit checking catches many wrong rearrangements before you reach the final answer.
Solve logically
Write the equation, rearrange, substitute with units, then calculate. Show a clear sequence of working. Examiners can award method marks only for what they can see.
Check whether the answer makes physical sense
Estimate the order of magnitude. Is the sign right? Is a car travelling at 3 × 108 m/s? Is a mass negative? A quick sense check is the fastest way to find a slip with powers of ten.
Answer exactly what was asked
A correct calculation can still lose marks if it answers the wrong question or ignores the command term. Give the final value with units and appropriate significant figures, or write the explanation in a short, logical chain.
Three original worked examples
These are our own practice-style questions, written to show the reading process. They are not taken from IB papers.
A car of mass 1200 kg accelerates uniformly from rest to 72 km/h in 8.0 s along a straight, level road. Determine the resultant force acting on the car.
- What you notice
- “Uniformly from rest” means constant acceleration. The speed is in km/h, but time is in seconds. “Determine” means a calculated answer.
- What matters
- m = 1200 kg, u = 0, v = 72 km/h, t = 8.0 s. Required: resultant force F.
- Physics concept
- Newton's second law with constant acceleration.
- Relationships
- a = (v − u)/t and F = ma.
- Working approach
- Convert 72 km/h to 20 m/s. Then a = 20/8.0 = 2.5 m s−2, and F = 1200 × 2.5 = 3000 N.
- Final check
- Units: kg × m s−2 = N. A 3 kN force for a small car is realistic. The force is in the direction of motion, so the sign is positive.
A 12 V cell with negligible internal resistance is connected to a 4.0 Ω resistor in series with a 6.0 Ω resistor. Calculate the power dissipated in the 6.0 Ω resistor.
- What you notice
- “Negligible internal resistance” means the terminal voltage is 12 V. “In series” means the same current flows through both. The question asks about only one resistor.
- What matters
- V = 12 V, R1 = 4.0 Ω, R2 = 6.0 Ω. Required: power in R2.
- Physics concept
- Series circuits and electrical power.
- Relationships
- Rtotal = R1 + R2, I = V/R, P = I2R.
- Working approach
- Rtotal = 10 Ω, so I = 1.2 A. P = (1.2)2 × 6.0 = 8.6 W (2 s.f.).
- Final check
- The total power is 12 × 1.2 = 14.4 W, and the 4.0 Ω resistor takes 5.8 W. The two parts add to 14.4 W, so the answer is consistent.
A sound wave of frequency 440 Hz travels through air at 20 °C at a speed of 340 m s−1. Determine its wavelength.
- What you notice
- The temperature is context that explains the speed. It is not needed in the calculation.
- What matters
- f = 440 Hz, v = 340 m s−1. Required: wavelength λ.
- Physics concept
- The wave equation.
- Relationship
- v = fλ, so λ = v/f.
- Working approach
- λ = 340/440 = 0.77 m (2 s.f.).
- Final check
- Units: (m s−1)/(s−1) = m. A wavelength of under a metre is typical for audible sound at this pitch.
Common IB Physics mistakes when reading questions
These patterns appear again and again in student work. Each one is fixable.
Reading only the final sentence
- Why it happens
- Students are rushing and assume the stem is background.
- The problem
- Conditions such as “from rest” or “negligible resistance” are missed.
- Do instead
- Read the whole question once, then underline conditions.
Choosing a formula too quickly
- Why it happens
- Formulas feel safe.
- The problem
- The equation may not suit the situation.
- Do instead
- Name the concept first, then pick the relationship.
Using every number given
- Why it happens
- Students assume all data must be used.
- The problem
- Irrelevant data enters the calculation.
- Do instead
- Decide what each number is for before substituting.
Ignoring units and conversions
- Why it happens
- Units feel like decoration.
- The problem
- Mixing km/h, g or cm with SI values gives answers off by large factors.
- Do instead
- Convert first and carry units through the working.
Misunderstanding command terms
- Why it happens
- Terms are treated as interchangeable.
- The problem
- A calculation is given where an explanation was needed, or the reverse.
- Do instead
- Circle the term and match your answer's length and type to it.
Confusing variables
- Why it happens
- Similar symbols (v, V, u, t, T) look alike under pressure.
- The problem
- Wrong values are placed in the equation.
- Do instead
- Write a short “given / required” list using clear symbols.
Skipping the diagram
- Why it happens
- Sketching feels slow.
- The problem
- Directions, forces and positions stay unclear.
- Do instead
- Draw a quick labelled sketch or free-body diagram.
Calculating without picturing the situation
- Why it happens
- Maths is treated as separate from Physics.
- The problem
- Impossible values go unnoticed.
- Do instead
- Say in one sentence what is physically happening.
Forgetting significant figures
- Why it happens
- Calculators give long decimals.
- The problem
- Marks are lost for unjustified precision.
- Do instead
- Match the least precise data value, usually 2–3 s.f.
Stopping after a number appears
- Why it happens
- Relief at finishing.
- The problem
- Wrong units, signs or magnitudes go unchecked.
- Do instead
- Spend ten seconds on a reasonableness check.
IB Physics command terms: what each one asks for
This is a practical guide to common terms, not a complete list. Check the official IB glossary in your subject guide for exact definitions.
| Command Term | What the Student Should Do | Common Mistake |
|---|---|---|
| State | Give a short, precise answer. No working or reasons needed. | Writing a paragraph when one line earns the mark. |
| Calculate | Find a numerical answer, showing the working. | Giving only the final number, or leaving out units. |
| Determine | Obtain the answer by calculation or from data or a graph. | Guessing instead of showing how the value was obtained. |
| Describe | Say what happens, or what a graph or pattern shows. | Explaining reasons when only a description was asked. |
| Explain | Give reasons using Physics principles, linking cause and effect. | Repeating the observation without a “because”. |
| Compare | Give similarities and differences, referring to both items. | Describing each item separately without linking them. |
| Suggest | Propose a sensible idea or explanation that fits the situation. | Leaving it blank because there is no single “correct” answer. |
| Estimate | Use reasonable approximations to get an order-of-magnitude value. | Trying to be exact, or using unrealistic values. |
| Sketch | Draw the general shape or relationship with labelled axes. | Missing axis labels, intercepts or the shape of the trend. |
| Outline | Give a brief summary of the main points. | Over-explaining or missing a key point. |
How to read different types of IB Physics questions
The same method applies everywhere, but what you look for changes with the question type.
Numerical calculations
Look for the target quantity, the given data, hidden conditions and any unit conversions. Show equation, substitution and answer with units.
Explanation questions
Look for the command term and the number of marks. Build a short chain: principle, link to the situation, conclusion. Each mark is usually one clear point.
Data-analysis questions
Check the units and uncertainties in the table first. Look for trends, outliers and what the data support. Use values from the data in your answer.
Graph questions
Read axis labels and units first. Ask whether the gradient, the area under the graph or the intercept carries the Physics meaning. Our approach to IB Physics graph questions goes deeper.
Experimental questions
Identify the independent, dependent and control variables. Look for sources of uncertainty and ways to improve accuracy or reduce random error.
Multi-step questions
Split the problem into parts. Write what each step must produce before attempting it, and carry unrounded values forward.
Diagram-based questions
Label every quantity on the diagram. Mark directions, forces, angles and lengths, then decide which values you need from it.
Unfamiliar contexts
Remove the story. Redraw the situation simply and ask which topic it belongs to. The Physics is nearly always from the syllabus.
A simple IB Physics question-reading method
The ten steps above can be compressed into six moves you can remember under exam pressure.
Exam checklist
- Have I read the whole question and diagram?
- Have I circled the command term?
- Do I know what my final answer should look like?
- Have I listed the given values with units?
- Have I crossed out unnecessary information?
- Can I name the concept being tested?
- Does my equation fit the conditions?
- Are all values converted to SI?
- Is my working in clear steps?
- Is my answer sensible in size and sign?
- Are units and significant figures correct?
- Did I respond to the question that was asked?
When IB Physics tutoring can help
Many students work hard and still plateau. These are signs that the issue may be technique, not effort:
- Understands lessons but struggles with exam questions
- Knows formulas but not when to use them
- Loses marks through question interpretation
- Struggles with unfamiliar problems
- Finds structuring explanations difficult
- Makes repeated calculation or unit mistakes
- Needs a more systematic approach to Physics problems
- Wants structured exam preparation
If several of these sound familiar, targeted support can be useful. If not, the method on this page may be all you need, and that is fine too.
How Nivara Academy supports IB Physics students
At Nivara Academy, IB Physics tutoring starts by finding out where marks are really being lost. We look at a student's own work and sort errors into reading, concept, equation selection and arithmetic. Then we practise a routine that fixes that specific weakness.
Question analysis
Decoding command terms, extracting data and identifying the concept, with practice on IB Physics problem-solving.
Structured answers
Setting out calculations and explanations the way examiners can award marks, with units and significant figures.
Exam preparation
Timed practice, error logs and review. See our IB Physics exam preparation page, or browse more IB Physics support.
A demo class is the easiest way to see whether our approach suits you. There is no obligation to continue.
IB Physics question-reading FAQs
How do I read an IB Physics question properly?
Read the whole question once without touching your calculator. Circle the command term, underline the data and conditions, and decide what the final answer must look like: a number with units, a sentence or a sketch. Only then choose a concept and an equation. This is the heart of IB Physics how to read a physics question as a method.
What should I identify first in an IB Physics question?
Identify the command term and the quantity or idea being asked for. This tells you whether to calculate, explain, describe or compare, and stops you from solving a different problem.
How do I know which Physics formula to use?
Match the formula to the physical situation, not to the numbers. List what is given and what is required, name the concept being tested, and choose the relationship that connects exactly those quantities. Check that the conditions behind the equation, such as constant acceleration, apply.
Why do I know the formulas but still struggle with Physics questions?
Knowing formulas is recall. Exam questions test interpretation: spotting the concept, ignoring irrelevant data and linking steps. A repeatable reading routine trains that missing skill.
How can I improve my IB Physics problem-solving skills?
Use one fixed routine on every question, write your working in a clear sequence and review each lost mark. Ask whether it was a reading, concept, equation or arithmetic error. Patterns show you what to practise.
How should I approach unfamiliar IB Physics questions?
Unfamiliar contexts usually test familiar ideas. Strip away the story, redraw the situation as a simple diagram, list the quantities and ask which syllabus topic they belong to. If you are stuck, write down what you do know, since method marks often come from relevant steps.
Do IB Physics tutors help with question interpretation?
A good tutor does. Working through real mistakes shows whether marks are lost through misreading command terms, weak concept links or poor answer structure, and then builds a routine to fix it.
How can I avoid careless mistakes in IB Physics exams?
Convert units before substituting, check units on both sides of the equation, keep sensible significant figures, and finish every answer with a quick check of size, sign and realism. Most careless errors disappear when these checks become habit.
How can I prepare for IB Physics exams more effectively?
Practise timed questions by topic, mark them strictly against mark schemes, keep an error log and revisit weak topics. Use your school's materials and the official IB resources for current information.
Ready to stop losing marks on question reading?
Practise IB Physics how to read a physics question with a tutor who works through your own mistakes. Book a demo class and see how the method fits your learning style.