science fair

I'm a 7th grader, and am doing a unicycle related science fair project.
I had someone coast 5 meters, with different tire inflations, and I
timed him. As I expected he went slower with the way under inflated
tire, but I need some research about tire inflation, and its affect on
speed, but when I google search it, it dosnt come up with anything
helpful. Could someone point me to a good website.


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You pretty much said it yourself. More air - harder tire - less rubber
on ground - less friction - more speed.The pattern of the tire affects
too. I've seen a finnish site that had info about inflation and how much
effect different tubes have on friction. The mass of the tire also
affects. If you have a heavier tire it rolls a bit farther (and if you
compare to a lighter tire at the same spot, faster).


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The only problem I see with timing somone coasting is that thier speed
starting might be slightly different every time which would change your
results and not give you the results you want.


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On Mon, 5 Jan 2004 17:15:39 -0600, Rob-the-unrepentant
om wrote:

I had someone coast 5 meters, with different tire inflations, and I
timed him.

I suppose that was done on a bike, not a unicycle?

I need some research about tire inflation, and its affect on
speed

Schwalbe has (or had) a graph of rolling resistance version tyre
pressure on their website. I forgot the url. If you Google for a few
of those terms combined, you may find it and other helpful sites.

Klaas Bil - Newsgroup Addict
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Go to google, and enter:

"rolling resistance" "tire pressure" research

You will find a variety of articles.

Good luck,

David Maxfield
Mitchell, SD


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David Maxfield
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