Cars are designed with crumple zones at the front and back.
How do crumple zones reduce injuries in a collision?
They reduce the time taken to stop, so the deceleration and force are smaller
They increase the time taken to stop, so the passengers gain more kinetic energy
They make the car more rigid, so the force spreads evenly over the passengers
They increase the time taken to stop, so the deceleration and force are smaller
50 exam-style questions on OCR GCSE Physics 8.1 Physics on the move, covering 8.1.1 Typical everyday speeds, 8.1.2 Typical everyday accelerations, 8.1.3 Ratios, units and rates on the road, 8.1.4 Human reaction times, 8.1.5 Factors affecting stopping distance, 8.1.6 Stopping distances at different speeds, 8.1.7 Dangers of large decelerations, 8.1.8 Estimating forces in road situations, and 8.1.9 Estimating the effects of large accelerations. Each one has a worked solution and a mark scheme showing where the marks go.