In a crash, a seat belt stretches slightly as it stops a passenger.
How does this reduce the risk of injury to the passenger?
The passenger stops over a shorter time, so the force on them is smaller
The passenger stops over a longer time, so the force on them is larger
The passenger stops over a longer time, so the force on them is smaller
The passenger keeps moving at a steady speed, so no force acts on them
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.