1. STOPPING DISTANCE

2. Stopping distance In this section you will
Learn that the stopping distance is the thinking
distance and the braking distance added together.
understand how different factors can affect the
thinking and braking distances.
explain speed-time graphs and calculate
information from them

3. stopping distance
thinking
distance
braking
distance

4. alcohol and stopping distance
Why does alcohol increase the overall stopping distance?

5. School bus travelling
at constant speed

6. stopping distance
braking
distance
thinking
distance

7. stopping distance braking thinking distance distance SORRY!!
If the driver drinks alcohol
It will change the way the
bus stops
stopping distance
braking
distance
thinking
distance
SORRY!!
so drinking alcohol increases the thinking distance
but does not affect the braking distance.
the overall effect is that the stopping distance is increased

8. Drinking alcohol affects the reaction time of the brain.
The effect it has a driver will be:-
The thinking distance will
The braking distance will
The overall stopping distance will
Name 2 things that will increase the thinking distance
Name 2 things that will increase the braking distance
Click to check answers

9. Drinking alcohol affects the reaction time of the brain.
The effect it has a driver will be:- increase the reaction time
The thinking distance will increase
The braking distance will stay the same
The overall stopping distance will increase
Name 2 things that will increase the thinking distance
Any 2 from distractions/old age/alcohol/tiredness
Name two things that will increase the braking distance
Any 2 from ice/snow/rain/worn brakes/poor road surface

10. Speed m/s 20 15 15.5 18 Time (s) Steady speed Before lights change
Thinking 20
Braking 15
15.5 18
Time (s)

11. Interpreting the graph
Speed(m/s)
Time (s) 20 15
15.5 18 A B C D
1 Describe the cars motion between A and C
2 What is the time from B to C called?
3 In which region is the driver braking?
4 What does the slope of the line CD show?
5 What is the area under BC? (Higher)
6 What is the area under CD? (Higher)
7 Which area is the total stopping distance?(Higher)

12. Click for answers Interpreting the graph Speed(m/s) Time (s) 20 15
15.5 18 A B C D
8 Work out the deceleration of the car
9 Calculate the thinking distance, the braking
distance and the stopping distance from the graph
10 Work out the braking force of the car if it has a
mass of 1Tonne. Hint Use F = m x a
Click for answers

13. Interpreting the graph
Speed(m/s)
Time (s) 20 15
15.5 18 A B C D
1 Describe the cars motion between A and C
Constant velocity
2 What is the time from B to C called?
Reaction time
3 In which region is the driver braking?
C to D
4 What does the slope of the line CD show?
The driver is braking/slowing down
5 What is the area under BC?
The thinking distance
6 What is the area under CD?
The braking distance
7 Which area is the total stopping distance?
The area under the graph between 15 and 18 seconds (Thinking distance +braking distance)

14. Interpreting the graph
Speed(m/s) A B C 20 D 15
15.5 18
Time (s)
8 Work out the deceleration of the car
20/2.5 = 8m/s
9 Calculate the thinking distance, the braking
Area = 0.5 x 20 = 10m
distance and the stopping distance from the graph
Area = 0.5 x 2.5 x 20 = 25m
10 Work out the braking force of the car if it has a
F = 1000 x 8 = 8000N
mass of 1Tonne. Hint Use F = m x a 2

15. Fill in the table below to show how the different factors affect the
stopping distance of vehicles. (The first one has been done for you)
thinking
braking
stopping
Tiredness
Coffee
Drugs
Fog
Old age
Alcohol
Worn brakes
Distractions
Snow/ice
rain
Click for answers

16. Fill in the table below to show how the different factors affect the
stopping distance of vehicles. (The first one has been done for you)
thinking
braking
stopping
Tiredness
yes no
Coffee
Drugs
yes (some)
Fog
Old age
Alcohol
Worn brakes
Distractions
Snow/ice
Rain

17. summary test
1 The slope of a speed-time graph represents
the vehicles:-
A force B speed C acceleration D distance
2 The time for a driver to see danger and
respond is called the
A braking time
B reaction time
C thinking distance
D stopping distance

18. A increase the thinking distance B increase the braking distance
3 Drinking alcohol will
A increase the thinking distance
B increase the braking distance
C decrease the thinking distance
D decrease the braking distance
4 The area under a speed-time graph is
A the acceleration B the reaction time
C the deceleration D the distance
5 Increasing the speed of a car will increase
the:-
A Reaction time
B Thinking distance and braking distance
C Thinking distance
D Braking distance
Now click for the answers

19. Answers
1 C
2 B
3 A
4 D
5 B

20. END