This definitions covers Key Definitions within Stopping Distances for GCSE Physics. Revise Stopping Distances in Forces for GCSE Physics with 15 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.
📖 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.
Practice questions for Stopping Distances
What is the correct definition of stopping distance?
Explain why a car travelling at higher speed has a greater braking distance than a car travelling at lower speed, assuming the same braking force.