Stopping vehicles as quickly as possible in an emergency is important but many factors affect this. The driver’s reactions and the road and vehicle conditions play a part, as well as mass and speed.
To stop a vehicle quickly, what is the thinking distance?
The distance travelled during braking
The distance travelled during the driver’s reaction time
The distance travelled between a driver seeing a hazard and the vehicle coming to rest
What is the formula for calculating the stopping distance for a vehicle?
Stopping distance = thinking distance + braking distance
Stopping distance = thinking distance - braking distance
Stopping distance = thinking distance × braking distance
Which of these would not increase braking distance?
The road being icy
Which of these is a good estimate of human reaction time?
Why would taking on more passengers increase a car’s stopping distance?
Greater mass means there is more friction between tyres and the road
More passengers means the driver is less likely to be distracted
Greater mass means there is more kinetic energy for the brakes to transfer
Which of these will be increased by making a car travel faster?
Thinking distance and braking distance
Thinking distance only
Braking distance only
What would be the effect of replacing old tyres for new ones?
Reduced braking distance
Increased braking distance
Reduced thinking distance
Which of these is a hazard of large vehicle decelerations?
Brakes may overheat
The vehicle stops in a very short distance
The vehicle is easily controlled
How is the braking force connected to the distance needed to stop a vehicle from 20 m/s?
The force and the distance always add up to 20
Larger braking force reduces the braking distance
Larger braking force increases the braking distance
If a car’s braking distance at 10 m/s is 26 m, what will the braking distance be at 20 m/s?