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anyone ski here????

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its for the same reason that you go faster in a water slide when laying down than when sitting up.
 
Originally posted by: andylawcc
Originally posted by: broon
Longer = faster.
Click to expand...

but how can I explain it to my friend though?

the only non-sensical way I can think of is:
Longer = larger contact surface. More Contact Surface = more negative resistance / "negative" friction. hence, faster.

anyone 😕 ? 🙂
Click to expand...

Not so, friction depends very little on contact area. Most of the resistance between a ski and snow is going to be from the ski sinking into the snow a little bit, and having to impound the snow if front of it as it moves forwards. Longer skis will not sink as far and therefore there will be less resistance to their travel.
 
Originally posted by: LordMorpheus
Originally posted by: andylawcc
Originally posted by: broon
Longer = faster.
Click to expand...

but how can I explain it to my friend though?

the only non-sensical way I can think of is:
Longer = larger contact surface. More Contact Surface = more negative resistance / "negative" friction. hence, faster.

anyone 😕 ? 🙂
Click to expand...

Not so, friction depends very little on contact area. Most of the resistance between a ski and snow is going to be from the ski sinking into the snow a little bit, and having to impound the snow if front of it as it moves forwards. Longer skis will not sink as far and therefore there will be less resistance to their travel.
Click to expand...

truth.. anyone who has taken elementary physica knows that fricion force = coefficient of friction times the weight of the object. neither of those are functions of surface area.
 
Originally posted by: andylawcc
Originally posted by: broon
Longer = faster.
Click to expand...

but how can I explain it to my friend though?

the only non-sensical way I can think of is:
Longer = larger contact surface. More Contact Surface = more negative resistance / "negative" friction. hence, faster.

anyone 😕 ? 🙂
Click to expand...

I can explain why longer = more stable. In physics it's called moment of inertia. A longer ski has more mass farther away from the axis of rotation so it's harder to turn and easier to keep pointed straight.
 
Originally posted by: ucdbiendog
Originally posted by: LordMorpheus

Not so, friction depends very little on contact area. Most of the resistance between a ski and snow is going to be from the ski sinking into the snow a little bit, and having to impound the snow if front of it as it moves forwards. Longer skis will not sink as far and therefore there will be less resistance to their travel.
Click to expand...

truth.. anyone who has taken elementary physica knows that fricion force = coefficient of friction times the weight of the object. neither of those are functions of surface area.
Click to expand...

so, the heavier the person, the slower he will go down hill?
 
Originally posted by: andylawcc
Originally posted by: ucdbiendog
Originally posted by: LordMorpheus

Not so, friction depends very little on contact area. Most of the resistance between a ski and snow is going to be from the ski sinking into the snow a little bit, and having to impound the snow if front of it as it moves forwards. Longer skis will not sink as far and therefore there will be less resistance to their travel.
Click to expand...

truth.. anyone who has taken elementary physica knows that fricion force = coefficient of friction times the weight of the object. neither of those are functions of surface area.
Click to expand...

so, the heavier the person, the slower he will go down hill?
Click to expand...

Not really. That formula for friction from 1st year physics is a very idealized model that assumes dry, smooth, rigid objects. A ski on snow is nothing like that. Snow is a soft surface that deforms under the ski. It's also partially melted, so the water acts as a lubricant, reducing friction.
 
Originally posted by: dwcal
Not really. That formula for friction from 1st year physics is a very idealized model that assumes dry, smooth, rigid objects. A ski on snow is nothing like that. Snow is a soft surface that deforms under the ski. It's also partially melted, so the water acts as a lubricant, reducing friction.
Click to expand...

yah, i remember my teacher told me something like that. ahhh, I remember now,
PV = nrT. As pressure increases, temp goes up and melts the ice.
 
Originally posted by: andylawcc
i was debating this with a friend. He said shorter the faster, and I argued for the vice versa. so which is true? What's the physics behind it?


oh also, anyone tried skiboard/bigfoot before? is it wierd to ski with such short blades?
Click to expand...

longer = faster always.... shorter are for tricks or shorter skiers
 
<-- Winter Mutt

Downhill/Cross-country/Board

I'd love to take all you speed freaks for a nice 5km hilly cross-country trail and see how you fare. I'll pick your worn, weary carcasses up with the sled on the second lap, and then you have to stare at my Spandex-clad ass for the rest of the trip. :evil:

- M4H
 
I have a pair of 207cm Blizzard Super G's that I use for icy hardpack & a pair of Rossi 191cm all-terrain for softer snow/moguls... both will go about the same speed if you point them straight down a steep slope, but staying in control is a LOT easier on the Blizzards.
 
Originally posted by: MercenaryForHire
<-- Winter Mutt

Downhill/Cross-country/Board

I'd love to take all you speed freaks for a nice 5km hilly cross-country trail and see how you fare. I'll pick your worn, weary carcasses up with the sled on the second lap, and then you have to stare at my Spandex-clad ass for the rest of the trip. :evil:

- M4H
Click to expand...



you wear Spandex?


🙂 heh
 
Originally posted by: andylawcc
Originally posted by: MercenaryForHire
<-- Winter Mutt

Downhill/Cross-country/Board

I'd love to take all you speed freaks for a nice 5km hilly cross-country trail and see how you fare. I'll pick your worn, weary carcasses up with the sled on the second lap, and then you have to stare at my Spandex-clad ass for the rest of the trip. :evil:

- M4H
Click to expand...



you wear Spandex?


🙂 heh
Click to expand...

Yep. Someone's gotta take up the stand of frightening small children when Fausto's not biking. :evil:

- M4H
 
Originally posted by: MercenaryForHire
<-- Winter Mutt

Downhill/Cross-country/Board

I'd love to take all you speed freaks for a nice 5km hilly cross-country trail and see how you fare. I'll pick your worn, weary carcasses up with the sled on the second lap, and then you have to stare at my Spandex-clad ass for the rest of the trip. :evil:

- M4H
Click to expand...

Must....get....flander's spandex butt out of my head.
 
Originally posted by: spidey07
Originally posted by: MercenaryForHire
<-- Winter Mutt

Downhill/Cross-country/Board

I'd love to take all you speed freaks for a nice 5km hilly cross-country trail and see how you fare. I'll pick your worn, weary carcasses up with the sled on the second lap, and then you have to stare at my Spandex-clad ass for the rest of the trip. :evil:

- M4H
Click to expand...

Must....get....flander's spandex butt out of my head.
Click to expand...

a quick Yahoo Picture search for the associated word will get me a 3 month vacation.


:shock; 🙂

here's a taste.
 
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