The diagram shows a ruler being used to estimate a student’s reaction time.
i) Describe how the ruler can be used to estimate student B’s reaction time.
[2]
ii) Why do the students repeat the experiment several times?
[1]
iii) Student B is very tired when they try this experiment.
Suggest how this might affect student B’s reaction time.
[1]
The driver of a car makes an emergency stop. The thinking distance is 9 m. The braking distance is 14 m.
i) Calculate the total stopping distance of the car.
Stopping distance = ...................................................... m [1]
ii) This graph shows how this driver’s stopping distance changes with speed.
A car is travelling at 50 mph.
There is a barrier in the road 40 m in front of the car.
The driver makes an emergency stop. Use the graph to work out if the car hits the barrier.
Explain how you obtained your answer.
[2]
iii) State one factor, other than speed, that affects braking distance.
Explain how this factor changes braking distance.
Factor ....................................................
Explanation ..........................................................
[3]
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