Join Date: Feb 2008
Location: Kingston, Ontario
to clarify - stopping distance going uphill VS downhill
Your calculated stopping distance is a complex mix of many physical factors and some very interesting mathematics. A full appreciation of the physics and calculations is over my head; so that 's why I asked my son.
To simplify what I said; what ever the stopping distance is for a certain road surface and speed, ( if all other variables are the same) it will be less if you are going up a steep hill and more if your are going down a steep hill.
Gravity is your friend going up and not so much when you are going down a steep grade entering into a tight hairpin turn.
I was curious to determine a rule of thumb, based on some true science, that would answer my question. If the grade happens to be about 15% uphill then you can use that to your advantage and stop ( as it turns out if you crank out all the math to it's conclusion) then low and behold you can stop in a distance about, yes coincidentally, 15% less. When riding downhill, the effect of gravity makes it such that you will need a longer distance in which to stop, so on a 15% grade you'll need about 30% longer to get stopped.
Similarly on a 6% grade; 6% less riding up and 12% more going down.
Road Toads Charter Member
- old guy goes stromabout on a 2007 Vee and finally has touched all of the 48 contiguous United states and the 10 Canadian provinces.