This definitions covers Key Definitions within Stopping Distances for GCSE Physics. Revise Stopping Distances in Forces for GCSE Physics with 13 exam-style questions and 5 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 6 of 12 in this topic. Make sure you can use the exact wording confidently, because definition marks are often lost through vague language.
Topic position
Section 6 of 12
Practice
13 questions
Recall
5 flashcards
📖 Key Definitions
Thinking distance: The distance a vehicle travels during the driver's reaction time (from seeing the hazard to applying the brakes). Thinking distance = speed × reaction time.
Braking distance: The distance a vehicle travels after the brakes are applied until it stops. Braking distance is proportional to v².
Stopping distance: Total distance to stop from first seeing the hazard. Stopping distance = thinking distance + braking distance.
Reaction time: The time between seeing a hazard and applying the brakes. Typical reaction time is 0.2–0.9 s. Affected by tiredness, alcohol, drugs, and distractions.