This higher tier covers Higher Tier: Braking Force and Friction 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 9 of 12 in this topic. This section is most useful once the core foundation idea is secure, because it adds the detail that pushes answers higher.
Topic position
Section 9 of 12
Practice
13 questions
Recall
5 flashcards
🎓 Higher Tier: Braking Force and Friction
When a large braking force is applied to a vehicle, large amounts of heat are generated in the brakes. If brakes overheat (e.g., on steep descents), they become less effective — brake fade reduces the available braking force and greatly increases stopping distance.
The relationship between braking force and deceleration comes from Newton's Second Law: F = ma, so a = F/m. For a 1200 kg car with a 6000 N braking force: a = 6000/1200 = 5 m/s². Using v² = u² + 2as with v = 0: braking distance s = u²/(2a).
Students are expected to be able to estimate the forces involved in typical road scenarios and comment on whether they are safe or dangerous.