A strong GCSE physics equations list is not just something to glance at the night before an exam. It is a working tool for revision, homework, required practicals, and exam technique. This guide gives you a clear checklist of the main GCSE physics equations you are likely to meet, explains what each formula is really doing, shows how to rearrange and use them, and highlights the small mistakes that often cost marks. Keep it as a living page you return to across the year, especially when your class moves topic or your exam board guidance changes.
Overview
If you want GCSE physics revision to feel less scattered, equations are one of the best places to start. Many students do not actually lose marks because the science is impossible. They lose marks because they choose the wrong formula, mix up the units, forget to convert values, or treat a formula as something to memorise rather than something to interpret.
This article is designed as a reusable GCSE physics formula sheet in words. It will help you do four things:
- know which kinds of equations commonly appear in GCSE physics
- understand what each symbol means
- rearrange formulas confidently
- check whether your final answer makes physical sense
One important note: different exam boards may vary in which equations are given and which are expected to be remembered. That means this guide works best when used alongside your own board specification and any formula sheet guidance issued by your school. Treat it as a master revision page, then adapt it to AQA, Edexcel, OCR, or your combined science route.
A simple method that works well is this:
- Identify the topic of the question.
- Write the known values with units.
- Choose the matching equation.
- Rearrange before substituting if needed.
- Substitute carefully with converted units.
- Check the size and unit of your answer.
If you do that every time, physics formulas stop feeling like random symbols and start becoming problem-solving tools.
Checklist by scenario
Use this section like a revision checklist. Return to the scenario you are revising, then test whether you can recognise, explain, and apply the relevant GCSE physics equations.
1. Motion and forces
These are core equations in forces and motion revision. They appear in straightforward calculations and in multi-step questions.
- Speed = distance / time
Use when an object travels a distance over a measured time.
Units: m/s, m, s - Acceleration = change in velocity / time
Use when speed changes over time.
Units: m/s², m/s, s - Force = mass × acceleration
Often written as F = ma.
Units: N, kg, m/s² - Weight = mass × gravitational field strength
Use weight in newtons, not mass in kilograms.
Units: N, kg, N/kg - Momentum = mass × velocity
Useful in collision questions.
Units: kg m/s
Worked use: A 1200 kg car accelerates at 2.5 m/s². Force = ma = 1200 × 2.5 = 3000 N.
What to remember: mass and weight are not the same; speed and velocity are not always used interchangeably in exam wording; acceleration can be negative when an object slows down.
2. Energy, work and power
These equations connect everyday physics ideas: moving, heating, lifting, and electrical use.
- Work done = force × distance
Use when a force causes movement in its direction.
Units: J, N, m - Kinetic energy = 0.5 × mass × speed²
Appears often in braking and moving object questions.
Units: J, kg, m/s - Gravitational potential energy = mass × gravitational field strength × height
Useful for lifting or falling objects.
Units: J, kg, N/kg, m - Power = energy transferred / time
Also power = work done / time.
Units: W, J, s - Efficiency = useful output / total input
Multiply by 100 if the answer is needed as a percentage.
Worked use: A 2 kg book is lifted 1.5 m. GPE = mgh = 2 × 9.8 × 1.5 = 29.4 J. If your course rounds g to 10 N/kg in some classroom work, check what your teacher expects.
What to remember: power is the rate of energy transfer, not the same as energy itself. Efficiency can be given as a decimal or a percentage, so read the question carefully.
3. Electricity revision physics checklist
Electricity questions are often very manageable once units are under control.
- Charge = current × time
Units: C, A, s - Potential difference = current × resistance
This is Ohm's law in equation form: V = IR.
Units: V, A, Ω - Power = current × potential difference
Units: W, A, V - Energy transferred = power × time
Units: J, W, s
Some courses also use an equation linking energy transferred, charge, and potential difference. Whether you need it from memory depends on your specification, so check your GCSE physics equations list from school.
Worked use: A 60 W lamp runs for 300 s. Energy transferred = Pt = 60 × 300 = 18,000 J.
What to remember: time may be given in minutes or hours, but the equation in joules uses seconds. Resistance is measured in ohms, not volts.
4. Density, pressure and fluids
These formulas often appear in both physics exam questions and required practical physics work.
- Density = mass / volume
Units: kg/m³ or g/cm³ depending on the question - Pressure = force / area
Units: Pa, N, m² - Pressure in a fluid increases with depth
At GCSE this is often tested more conceptually, though some students meet a formula depending on course content.
Worked use: A block has mass 0.24 kg and volume 0.0001 m³. Density = 0.24 / 0.0001 = 2400 kg/m³.
What to remember: volume conversions are a frequent trap. If one value is in cm³ and another expects m³, convert before calculating.
5. Thermal physics and energy resources
These questions can look wordy, but the mathematical structure is usually simple.
- Change in thermal energy = mass × specific heat capacity × temperature change
Units: J, kg, J/kg°C, °C - Energy for a change of state = mass × specific latent heat
Units: J, kg, J/kg
Worked use: Heating 0.5 kg of water by 20°C with specific heat capacity 4200 J/kg°C gives: E = mcΔT = 0.5 × 4200 × 20 = 42,000 J.
What to remember: temperature change is not the final temperature. If water goes from 18°C to 65°C, the change is 47°C.
6. Waves and radiation
Waves revision notes usually centre on one key calculation and a lot of interpretation.
- Wave speed = frequency × wavelength
Units: m/s, Hz, m - Period = 1 / frequency
Sometimes useful if a question gives oscillation timing.
Worked use: A wave has frequency 5 Hz and wavelength 2 m. Wave speed = fλ = 5 × 2 = 10 m/s.
What to remember: hertz means per second. If wavelength is measured from the wrong points on a wave diagram, the whole answer will be wrong even if the formula is right.
7. Radioactivity and half-life
Many GCSE questions here are more about patterns and interpretation than algebra, but equations can still appear.
- Activity is measured in becquerels
- Half-life calculations often use repeated halving rather than a formal algebraic equation at GCSE
Checklist point: make sure you can read decay graphs, count half-lives, and connect the graph to the context.
8. Required practicals and equation use
Required practical physics questions often test equations indirectly. You may collect data, plot a graph, and then calculate a quantity using the gradient or one pair of values.
Examples include:
- finding density from mass and volume
- finding resistance from current and potential difference
- finding speed from a distance-time setup
- using thermal energy formulas after a heating experiment
When you write up a practical, include units at every stage. That habit carries straight into exam questions.
For more exam application practice, it helps to combine your formula work with past paper technique. See How to Use Past Paper Questions as a Mini Scenario Analysis Exercise and Past-Paper Strategy for Digital Exams: How to Prepare When Questions Feel More Interactive.
What to double-check
Before you finalise any answer, run through this short checklist. It prevents many of the most common errors in GCSE physics revision and exam work.
- Am I using the right formula for the topic?
A power question and an energy question may use similar numbers but need different equations. - Do I know what each symbol stands for?
In physics formulas, similar letters can mean different things in different topics. - Are my units consistent?
Convert minutes to seconds, centimetres to metres, grams to kilograms, and cm³ to m³ when needed. - Have I rearranged the formula before substituting?
This is usually safer than trying to do algebra mentally midway through the calculation. - Did I square the speed correctly?
Kinetic energy questions often go wrong here. - Is the answer sensible?
A negative resistance or a tiny force for a large accelerating car should make you pause and recheck. - Did I include the unit in the final answer?
Marks can be lost even when the number is correct.
A useful habit is to write a quick unit line beneath your calculation. For example, for force = mass × acceleration, check that kg × m/s² gives N. This reinforces the logic of the formula instead of treating it like a memory test.
If you are building a broader revision system, you may also find Physics Revision in Hybrid Learning: What Works Best for Memory, Speed, and Exam Performance? useful for planning spaced review.
Common mistakes
The fastest way to improve with GCSE physics equations is to notice the mistakes that repeat.
Memorising letters without understanding the relationship
If you only memorise that V = IR, you may freeze when the question asks for current. If you understand that potential difference depends on current and resistance, rearranging becomes easier: I = V / R.
Forgetting unit conversions
This is one of the biggest sources of lost marks. A student may know the correct equation but still get the wrong answer because 5 minutes was used as 5 seconds, or 200 g was used as 200 kg.
Confusing mass and weight
Mass is measured in kilograms. Weight is a force measured in newtons. The equation weight = mass × gravitational field strength is there to connect them, not to show they are the same thing.
Using the final temperature instead of temperature change
In thermal energy questions, always calculate the difference between starting and final temperatures first.
Dropping the square in kinetic energy
In the equation for kinetic energy, speed is squared. Doubling speed does not just double the kinetic energy; it increases it much more.
Rearranging formulas inconsistently
Students sometimes move terms across the equals sign without applying the same operation properly. Practise rearranging on its own, away from full exam questions.
Ignoring the context
A calculated answer should fit the situation. If a person walks at 300 m/s, something has gone wrong. Physics exam technique includes checking whether the value is realistic.
For students who like structured comparison methods when reviewing solutions, A-Level Physics Revision Using the “Second Opinion” Method offers a process that can still be adapted for GCSE work.
When to revisit
This is not a page to read once and forget. GCSE physics formulas make more sense when revisited at the right moments.
Come back to your equations list:
- at the start of each new topic to see which formulas belong to that unit
- before a required practical so you know what quantity you are measuring or calculating
- after marked homework or tests to identify patterns in your mistakes
- when your school updates exam guidance on which equations are given or memorised
- in the final weeks before exams to practise mixed-topic retrieval
A practical routine is to split your revision into three layers:
- Know it: can you state the formula and define each symbol?
- Use it: can you solve a standard one-step question?
- Apply it: can you handle a multi-step question, practical context, or graph-based question?
If you want one action to take today, make your own personal GCSE physics equations checklist. Use a page or spreadsheet with five columns:
- equation
- topic
- units
- rearrangements I know
- mistakes I keep making
That turns a static GCSE physics formula sheet into a revision tool that improves with you.
Finally, remember that equations are only one part of strong physics revision. They work best when paired with clear notes, worked examples, and regular past paper questions. Used that way, your equations list becomes something much more useful than a memory test: it becomes a map of the course.
