Quote:
Originally Posted by Isaac Zachary
It doesn't sound like what I've always understood.
Why would the coefficient change as you drive? From what I've always understood it stays about the same.
UNLESS we are talking about power to overcome rolling resistance. That does increase with the square of the velocity.
But the force to overcome rolling resistance should be about the same. The amount of energy per measure of distance will be about the same.
The power increases because the faster you go the more energy per measure of distance gets eaten up quicker as you travel more distance per measure of time.
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The explanation for the increase in RR vs speed is that a rolling tire generates a standing wave in the tire - which consumes energy. The faster the speed, the larger the wave and the more energy it consumes.
Edit: There are images for graphs showing RR vs speed. They don't seem to be showing up. Here are links:
http://barrystiretech.com/rrvsspeed.png
http://barrystiretech.com/truckrrvsspeed.gif