Question 16
HCar manufacturers test the safety of cars by crashing them into a barrier at 15 m/s.
A crash-test dummy of mass 75 kg sits in each car.
In test A the car has no crumple zone. In test B the car has a crumple zone.
The Figure shows how the velocity of the dummy changes in each test.
Figure
a.[2]
Calculate the deceleration of the dummy in test A.
b.[3]
Calculate the force on the dummy in test B.
c.[2]
Use the Figure to determine the distance the dummy moves while it is stopping in test B.
d.[3]
Explain how a crumple zone reduces the risk of serious injury to the people in a car during a crash.
8.1 Physics on the move Questions
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.