Stopping Distance — GCSE Physics Revision
Revise Stopping Distance for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Speed, Velocity & Acceleration (GCSE)What is Stopping Distance?
The stopping distance of a vehicle is the total distance it travels from the moment the driver spots a hazard to the moment the vehicle comes to a complete stop. It is the sum of the thinking distance (the distance travelled during the driver's reaction time) and the braking distance (the distance travelled while the brakes are applied).
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The relationship between speed and braking distance is a key point for Higher Tier.
Step-by-step explanationWorked example
A car is travelling at 20 m/s. The driver's reaction time is 0.5s. What is the thinking distance? Solution: Thinking Distance = Speed x Reaction Time. Thinking Distance = 20 m/s x 0.5s = 10m.
Mini lesson for Stopping Distance
1. Understand the core idea
The stopping distance of a vehicle is the total distance it travels from the moment the driver spots a hazard to the moment the vehicle comes to a complete stop. It is the sum of the thinking distance (the distance travelled during the driver's reaction time) and the braking distance (the distance travelled while th...
Can you explain Stopping Distance without copying the notes?
2. Turn it into marks
A car is travelling at 20 m/s. The driver's reaction time is 0.
Underline the method, evidence, or command-word move that would earn credit in GCSE Forces.
3. Fix the likely mark leak
Watch for this mistake: Confusing thinking distance and braking distance. Thinking distance depends on reaction time and speed. Braking distance depends on speed, mass, and factors affecting friction like road conditions and brake quality.
Write one correction rule before doing another practice question.
Practise this topic
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Stopping Distance practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Stopping Distance is testing.
Answer: The stopping distance of a vehicle is the total distance it travels from the moment the driver spots a hazard to the moment the vehicle comes to a complete stop. It is the sum of the thinking distance (the distance travelled during the driver's reaction time) and the braking distance (the distanc...
Mark focus: Precise definition and topic focus.
Question 2
A Stopping Distance question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Confusing thinking distance and braking distance. Thinking distance depends on reaction time and speed. Braking distance depends on speed, mass, and factors affecting friction like road conditions and brake quality." What should their next repair task be?
Answer: Do one Stopping Distance question and review the mistake type.
Mark focus: Error correction and next-step practice.
Stopping Distance flashcards
Core idea
What is the main idea in Stopping Distance?
The stopping distance of a vehicle is the total distance it travels from the moment the driver spots a hazard to the moment the vehicle comes to a complete stop. It is the sum of the thinking distance (the distance tr...
Common mistake
What mistake should you avoid in Stopping Distance?
Confusing thinking distance and braking distance. Thinking distance depends on reaction time and speed.
Practice
What is one useful practice task for Stopping Distance?
Answer one Stopping Distance question and review the mistake type.
Exam board
How should you use board notes for Stopping Distance?
Covered by all major boards (AQA, Edexcel, OCR). The relationship between speed and braking distance is a key point for Higher Tier.
Common mistakes
- 1Confusing thinking distance and braking distance. Thinking distance depends on reaction time and speed. Braking distance depends on speed, mass, and factors affecting friction like road conditions and brake quality.
- 2Thinking that stopping distance is directly proportional to speed. The thinking distance is, but the braking distance is proportional to the square of the speed. This means doubling your speed quadruples your braking distance.
- 3Forgetting to mention all the factors that can affect stopping distance. These include driver-related factors (tiredness, alcohol, distractions) and vehicle/road factors (worn brakes/tyres, wet/icy roads).
Stopping Distance exam questions
Exam-style questions for Stopping Distance with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Stopping Distance
Core concept
The stopping distance of a vehicle is the total distance it travels from the moment the driver spots a hazard to the moment the vehicle comes to a complete stop. It is the sum of the thinking distance…
Frequently asked questions
What factors affect thinking distance?
Thinking distance is primarily affected by the driver's reaction time, which can be increased by tiredness, alcohol, drugs, or distractions like using a mobile phone. It is also directly proportional to the speed of the vehicle.
What factors affect braking distance?
Braking distance is affected by the vehicle's speed (it increases with the square of the speed), its mass, the condition of its brakes and tyres, and the road conditions (e.g., wet or icy roads reduce friction).