A battery-powered airfield service vehicle is tested on a level surface. It is brought to rest by braking in each test. The mean braking force is constant during each test.
| Test | Total mass in kg | Initial speed in m/s\text{m/s}m/s | Mean braking force in N |
|---|---|---|---|
| A | 800 | 15 | 6000 |
| B | 1000 | 12 | 3000 |
Compare the initial kinetic energy stores of the vehicle in tests A and B. Use calculations to support your answer.
Calculate the braking distance in each test.
Explain why the braking distance in test B is different from the braking distance in test A.
In test C, the vehicle has the same total mass and the same mean braking force as in test A. The braking distance must be no more than 9.6 m.
Calculate the greatest initial speed of the vehicle in test C.
126 exam-style questions on Edexcel GCSE Physics 2.5 Stopping and braking distances, covering 2.5.1 Stopping distance and reaction time, 2.5.2 Factors affecting stopping distance, 2.5.3 Dangers of large decelerations, and 2.5.4 Braking distance and initial speed. Each one has a worked solution and a mark scheme showing where the marks go.