Erm, the distance that it takes to stop..............just a wild stab in the dark there.
Yes, friction affects stopping distance. The greater the friction the lower the stopping distance; the lower the friction the greater the stopping distance.
Stopping distance at 30mph = 23m
Stopping Distance = 15 feet
Stopping Sight Distance
Stopping Distance = about 146.25 feet.
The stopping distance of a car increases.
The steeper the slope, the longer the stopping distance is.
Trains require a long stopping distance.
Stopping distance also increases.
Stopping distance at 40mph = 36m
Total stopping distance is the thinking distance (The distance it takes for your brain to process the event and decide to stop the car) and the stopping distance (The distance it takes to stop the car once deceleration has begun) added together.
Stopping Distance = about 315 feet at 70 mph