A family car is travelling at a typical speed on a motorway. The driver brakes in an emergency. The car stops in a braking distance of 60 m.
Estimate the braking force on the car.
Use the Equation Sheet.
Show your working and state any values that you estimate.
On another day, the car crashes into a wall at the same speed. The front of the car crumples by 0.60 m as it stops.
Without doing a full calculation, compare the force on the car in the crash with the braking force in (a). Explain your answer.
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.