# Physics-cars,the Highway code and collisions

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what is the total stopping distance of a vechice made up of?
the thinking distance and the braking distance. total stopping distance = thinking distance + braking distance
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what is thinking distance?
the distance the vechine travels while the driver sees the hazard,thinks about braking and then actually reacts to put the brakes on
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what is the braking distance?
the distance that the vehicle moves while the brakes are being applied and the vechine is decelerating to 0 m/s
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name factors which the thinking distance depends on
the velocity of the car,the reaction time of the driver(which depends on tiredness,alcohol use etc),the driver may be distracted,driver may have been using mobile phone
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name factors which the braking distance depends on
the velocity of the car,the mass of car,condition of the brakes,condition of tyres,condition of road surfaces,the weather
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what safety systems are now built in cars to reduce forces that cause injuries?
seat belts,air bags,crumple zones.these work by increasing the of the collision by allowing seat belts to stretch,airbags deflate,crumple zones crumple in on themselves
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two ways of reducing the force
reduce the speed of the collision so reducing the change of momentum and increasing the time for collision
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## Other cards in this set

### Card 2

#### Front

what is thinking distance?

#### Back

the distance the vechine travels while the driver sees the hazard,thinks about braking and then actually reacts to put the brakes on

### Card 3

#### Front

what is the braking distance?

### Card 4

#### Front

name factors which the thinking distance depends on

### Card 5

#### Front

name factors which the braking distance depends on