1. IP2.8.5 Factors affecting braking distance © Oxford University Press 2011 Factors affecting braking distance

2. IP2.8.5 Factors affecting braking distance © Oxford University Press 2011  There are many factors that can affect the braking distance.  Can you think of some factors that will affect the braking distance, other than the car’s speed?  The condition of the brake pads  The condition of the tyres  The type of road surface  Ice on the road  Water on the road

3. IP2.8.5 Factors affecting braking distance © Oxford University Press 2011  Remember that the factors affecting the braking distance come in two groups, those that affect the frictional forces between the tyre and road and those that affect the frictional forces between the brake pads and discs in the wheels.  If the brake discs are badly or unevenly worn then this can reduce how much force they can apply.  If the road surface is poor (it may be a small road with bits of gravel on it) then the wheels may slip, increasing the braking distance.  If there is ice or water on the road then the friction between the tyres and the road will be reduced and the car is more likely to skid. If tyre tread is low or the tyres are in a poor condition the risk of skidding is increased further.

4. IP2.8.5 Factors affecting braking distance © Oxford University Press 2011  You don’t need to remember actual stopping distances but you do need to remember what can affect them, such as reaction time, condition of vehicle and road conditions.