This animation shows how the braking distance of a car is determined by the speed of the car and the road conditions.

Enter a speed from 0 - 120km/h & a reaction time from 0 to 2 seconds to calculate the stopping distance.

Choose the road conditions; dry, wet or icy to see their effect. The different conditions change the co-efficient of friction; this is a measure of how much friction there is between the tyres and the road.

1. What is the dry road braking distance for a car travelling at 50km/h?
2. What is the dry road braking distance for a car travelling at 100km/h?
3. What effect does have doubling the speed have on the braking distance?
4. What is the wet road braking distance for a car traveling at 100km/h? How much further does the car require to stop when wet?