STOPPING DISTANCE

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

stopping distance thinking distance braking distance

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

School bus travelling at constant speed

stopping distance braking distance thinking distance

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

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

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

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

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)

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

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)

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

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

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

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

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

Answers 1 C 2 B 3 A 4 D 5 B

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