Engineers compare two seat belt designs, X and Y, in crash tests. In each test, a crash-test dummy of mass 60 kg travelling at 12 m/s is brought to rest by the seat belt. The stopping times are shown in the table.
| Seat belt design | Stopping time |
|---|---|
| X | 0.080 s |
| Y | 0.20 s |
Calculate the magnitude of the average resultant force on the dummy for each seat belt design.
Explain which seat belt design would give a passenger the lower risk of injury.
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.