Choose a focused resource
Use the resource cards below to revise one idea at a time. Each page includes worked examples, mini quizzes, practice questions, exam language and a visual or simulation when it adds learning value.
GCSE Physics resources
AQA GCSE Forces
AQA GCSE Forces Revision
Forces questions often hide a simple model inside a diagram. Draw the forces, find the resultant, then connect the resultant to the motion or deformation.
Start here
Your route through this topic
Use the resource cards below to revise one idea at a time. Each page includes worked examples, mini quizzes, practice questions, exam language and a visual or simulation when it adds learning value.
By the end, you should be able to…
- Explain choose a focused resource using precise physics language.
- Apply the relevant equations, diagrams or practical method to an exam-style situation.
- Use the mini quizzes and practice answers to identify and correct a misconception.
Core learning content
Learn the idea before you practise it
Start with this short teaching sequence for AQA GCSE Forces Revision. Read the model, use the visual, then test your recall before moving into examples and exam practice.
Draw the forces first
A force is an interaction that can change motion or shape. A free-body diagram should show the object, labelled force arrows and their directions. Do not draw forces that are not acting.
Use the right relationship
Choose a relationship because of the physical change in the question, not because it is familiar. Weight: W = mg (N, kg, N/kg). Newton’s second law: F = ma (N, kg, m/s²). Momentum: p = mv (kg m/s). Keep the unit next to each value while you substitute.
What a strong answer does
Use precise definitions, show the relevant working and link each conclusion to the physics evidence in the question. Before writing, underline the command word and identify the information that matters. Keep a calculation as equation, substitution and answer with unit; keep an explanation as a linked chain using because, so or therefore. Finish by checking that the final sentence answers the exact context in the question and that the number, direction or conclusion agrees with the evidence given.
Retrieval practice
Quick checks
Answer without looking back first. The feedback explains the model, so a wrong answer still helps you learn.
Mini quiz 1
Force diagrams
Mini quiz 2
Equations
Mini quiz 3
Apply the model
Worked examples
See the method being built
Cover the answer, attempt the method and then compare your physics language as well as the number.
Example 1 · Resultant force
A 1 200 kg car has a resultant force of 3 600 N. Calculate its acceleration.
- Use F = ma.
- Rearrange to a = F ÷ m.
- a = 3 600 ÷ 1 200.
Show the answer
3.0 m/s².
Example 2 · Weight
Calculate the weight of a 55 kg pupil on Earth using g = 9.8 N/kg.
- Use W = mg.
- W = 55 × 9.8.
Show the answer
539 N, or 5.4 × 10² N to two significant figures.
Example 3 · Moment
A 20 N force acts 0.30 m from a pivot at right angles. Calculate the moment.
- Use moment = force × perpendicular distance.
- 20 × 0.30 = 6.0.
Show the answer
6.0 N m.
Misconception clinic
Common wrong turns
Each of these is tempting because it sounds almost right. Replace it with the precise physics before you meet it in a question.
- Drawing an arrow for motion as if it were a force.
- Assuming zero resultant force means zero velocity.
- Using distance rather than perpendicular distance in moments.
- Reading a graph gradient with the wrong axes or units.
Independent practice
Exam-style questions
Use the working space first. Reveal the guidance only after you have committed to an answer, then improve the exact part that would gain the next mark.
1. State the unit of force.
[1 mark]Show answer and marking guidance
Newton (N).
2. A 2.0 kg trolley accelerates at 4.0 m/s². Calculate the resultant force.
[2 marks]Show answer and marking guidance
F = ma = 2.0 × 4.0 = 8.0 N.
3. Explain why a seat belt reduces injury in a collision.
[3 marks]Show answer and marking guidance
It increases the time taken for the person’s momentum to change, reducing the average force.
4. Describe the motion represented by a horizontal line on a distance–time graph.
[2 marks]Show answer and marking guidance
The distance is constant, so the object is stationary.
5. Explain why a spring eventually stops obeying Hooke’s law.
[3 marks]Show answer and marking guidance
Beyond the limit of proportionality, extension is no longer proportional to force and the material may not return to its original length.
6. What is conserved in an isolated collision?
[2 marks]Show answer and marking guidance
Total momentum is conserved.
Focused revision
Choose one idea at a time
When you are ready to go narrower, each focused page follows the same learning route: explain, check, explore, diagnose and practise.
FO-01
Scalars, Vectors and Free-Body Diagrams
Scalars have magnitude only; vectors have magnitude and direction. A free-body diagram should show all relevant forces acting on one object, with arrows in the correct directions and labels that identify the interaction.
FO-02
Motion Graphs, Speed and Acceleration
Use graph gradient and area carefully. A curved distance–time graph shows changing speed; a horizontal velocity–time line shows constant velocity; a negative velocity can still have a positive speed.
FO-03
Newton’s Laws, Resultant Force and Acceleration
Newton’s laws describe how forces change motion. Use F = ma for the resultant force, not one individual force, and explain that acceleration is in the direction of the resultant.
FO-04
Forces, Elasticity and Springs
For a spring obeying Hooke’s law, extension is proportional to force. The limit of proportionality is where the graph stops being straight; beyond the elastic limit the spring may not return to its original length.
FO-05
Moments, Levers and Pressure
A moment is the turning effect of a force about a pivot and uses perpendicular distance. Pressure is force per unit area, so the same force can produce different pressures when the contact area changes.
FO-06
Momentum, Conservation and Safety
Momentum is mass × velocity and is conserved in a closed system. Safety features reduce force by increasing collision time or reducing the change in momentum experienced by a person.
FO-07
Force and Extension Required Practical
Add loads to a spring or wire, measure extension from the unloaded length and plot force against extension. Increase the load carefully, remove loads for repeats where appropriate and identify the straight-line region.
FO-08
Acceleration Required Practical
Use a trolley and light gates or video timing to measure speed and acceleration. Reduce friction where possible, repeat readings and keep the mass or force controlled according to the variable being investigated.
Keep going
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Questions pupils ask
GCSE Physics FAQs
What is the key idea in AQA GCSE Forces Revision?
Forces questions often hide a simple model inside a diagram. Draw the forces, find the resultant, then connect the resultant to the motion or deformation.
How should I practise AQA GCSE Forces Revision?
Read the snapshot, attempt the worked examples without looking, complete the mini quizzes and then use the practice questions to check your wording and method.
Next step
Keep your revision moving
Physics sticks when you move between explanation, retrieval and application.