Topic 5 Stopping Distances

Question 1

What is an emergency stop

Answer 1

When the Maximum force is applied to in the brakes in order to stop the car in the shortest possible distance

Question 2

What does the longer it takes to do an emergency stop mean

Answer 2

The higher the risk of crashing

Question 3

Stopping distance =

Answer 3

Braking distance + thinking distance

Question 4

What is thinking distance

Answer 4

How far a car travels during the drivers reaction time

Question 5

What is the drivers reaction time

Answer 5

What time between the drive a seeing a hazard and applying the brakes

Question 6

What is braking distance

Answer 6

Distance to take you to stop under the braking force once the brakes are applied

Question 7

Typical car breaking point

Answer 7

40 m at 30 mph
55 m at 60 mph
75 m at 70 mph

Question 8

What is thinking thinking distance affected by

Answer 8

Speed- the faster you travel the further you’ll travel during the time you react
Reaction time- the longer your reaction time the longer your thinking distance

Question 9

What is braking distance effected by

Answer 9

Speed- for given braking distance the faster a vehicle travels the longer it takes to stop
Weather or road surface- if it is wet or icy are there are leaves or oil on the road there is less grip so less friction between the vehicles tires and the road causing them to skid
Condition of tyres- bald tyres (don’t have any tread left) cannot get rid of water in wet conditions which leads them skidding on top of water
Condition of brakes- if worn or faulty they won’t be able to apply as much force as well maintained brake

Question 10

What happens if you have a longer stopping distance

Answer 10

Give more space you need from other cars in order to be safe

Question 11

What happens when brake peddle is pushed

Answer 11

Brake pads pressed onto the wheels causing friction which causes work to be done between the brakes and the wheels transferring energy from the kinetic stored of the wheels to the thermal energy store of the brakes amd increase the temperature

Question 12

The faster a vehicle is going the more energy it has in its kinetic energy store so

Answer 12

More work needs to be done to stop it so a larger deceleration is needed to stop it within a certain distance

Question 13

What does a larger braking force mean

Answer 13

Larger deceleration

Question 14

Why can large deceleration be dangerous

Answer 14

May cause brakes to overheat so won’t work as well or could cause vehicle to skid