Thinking vs Braking — "Driver vs Car":
Thinking distance is all about the DRIVER — their reaction time, whether they're tired, drunk, or distracted.
Braking distance is all about the CAR and ROAD — tyre grip, brake quality, road surface, vehicle mass.
Speed and distance relationship:
- Thinking distance ∝ v (speed doubles → thinking distance doubles) — linear relationship
- Braking distance ∝ v² (speed doubles → braking distance ×4) — squared relationship
Memory trick: "Thinking is T (linear), Braking is B (bigger — squared)"
This memory aid covers Memory Aid 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 8 of 12 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
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.