If a vehicle is travelling at a steady speed the resultant force on it is zero. The driving forces are equal and opposite to the frictional forces.The faster the speed of a vehicle, the bigger the deceleration needed to bring it to rest in a particular distance. So the bigger the braking force needed.
The stopping distance of a vehicle is the distance is the distance it travels during the driver's reaction time (the thinking distance) plus the distance it travels under under the braking force (the braking distance). The thinking distance is increased if the driver is tired or under the influence of alcohol or drugs.
The braking distance can be increased by poorly maintained roads, bad weather conditions and the condition of the car. For example, worn tyres or worn brakes will increase braking distance.
The 'thinking distance' is the distance travelled by the vehicle in the time it takes the driver to react. The braking distance is the distance the vehicle travels unmder the barking force.
Stopping Distance = Thinking distance + Braking distance
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