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So, uhh...

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kootenayklaus
Posts: 3914 - Karma: 2,179
My mind is killing itself over this, and I jsut want your opinions on it. The contact point of a circle to a line is a point, and the contact point of a plane (ski) to a cylinder (any rails involving circles. Single barrel, double barrel, large tube, etc.) is a line. A line does not have a determined width, and if it does it is a quadrilateral. Technically speaking, if we slide a circular rail we are not touching it, even if it is multiple barrels wide. If we are are doing switch ups, etc, on the rail, are we just doing them in mid air? Help please.
Dec 27 2010 4:33PM
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broto
Posts: 9039 - Karma: 25,658
well for double, triple, etc. barrel rails, you are grinding 2 lines. which gives it width. now it becomes a quadrilateral.
Dec 27 2010 4:35PM
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1337
Posts: 31038 - Karma: 29,003
>implying every rail and ski in the real world is a perfect shape
Dec 27 2010 4:35PM
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kootenayklaus
Posts: 3914 - Karma: 2,179
yes. implying that they are perfect circles.
Dec 27 2010 4:37PM
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kootenayklaus
Posts: 3914 - Karma: 2,179

okay, so scratch my double barrel theory. that still doesn't solve the single barrel.

Dec 27 2010 4:39PM
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RubberSoul
Posts: 11249 - Karma: 14,642
yeah it's interesting. but the notion that a point has no width is pretty much only in theory right? but yeah it's a tiny little bit of contact area where your ski is on a round rail
Dec 27 2010 4:41PM
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broto
Posts: 9039 - Karma: 25,658
also, the rail or ski might bend or conform to the shape of the other, even if it is just the very slightest.
Dec 27 2010 4:46PM
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clark.
Posts: 308 - Karma: 14
If every rail was a perfect circle, then yes. But you also have to take into consideration that skis flex when you slide rails. So the ski will flex and conform to the rail, touching it at more than one point (more points than just the tangent to the rail).
Dec 27 2010 4:46PM
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kootenayklaus
Posts: 3914 - Karma: 2,179
that's another factor to take it. So, if the rail was a perfect circle, and your skis didnt conform to the rail, what would we be doing of a round rail?
Dec 27 2010 4:49PM
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broto
Posts: 9039 - Karma: 25,658
but they do
Dec 27 2010 4:53PM
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Mr.Feeny
Posts: 990 - Karma: 11
I am soo high right now and I have no freaking idea what you just said, I have absolutely no clue what you are trying to relay to me
Dec 27 2010 5:00PM
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Deezy
Posts: 4580 - Karma: 1,004
but the skis flex and the rails are not perfect. your edges are also dulled and not perfectly straight.
the materials are not perfect so they do deform.
we dont ski in school, lets keep it that way
Dec 27 2010 5:16PM
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iggs
Posts: 827 - Karma: 39
well you have to find the dircumcenter and subtract it from principle vector and add it to the vex using the schwarb principle. its really quite simple
Dec 27 2010 7:31PM
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DrZoidberg
Posts: 5675 - Karma: 4,268
If you consider the contact point a line, then you're touching an infinitely thin but still existing line. If you count the likely deformation of the ski and other stuff like that than uhh you're contacting a small yet measurable solid.
Dec 27 2010 8:07PM
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PeterWojnar
Posts: 3937 - Karma: 678
Let me guess, you didn't do so well in highschool freshman geometry, did you.
Dec 27 2010 8:12PM
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zerospinskier
Posts: 4867 - Karma: 350
Yes, real world physics and theoretical physics are completely different. Unfortunately you are not floating on the rail.
Dec 27 2010 8:13PM
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kootenayklaus
Posts: 3914 - Karma: 2,179
It was just a theory in mind and a thought. thanks to anyone who contributed.
Dec 27 2010 8:16PM
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TheClap.
Posts: 21649 - Karma: 4,013
Yup
Dec 27 2010 8:17PM
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Toonoman
Posts: 265 - Karma: 20
To be honest i did not read any of this cause my kinda drunk and tired eyes could not really like follow it
Dec 27 2010 8:31PM
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Stickity
Posts: 7750 - Karma: 769
technically nothing has ever touched anything because of the unbelievably strong electromagnetic force that appears between atoms
everything floats
Dec 27 2010 9:07PM
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RubberSoul
Posts: 11249 - Karma: 14,642
i was gonna say, if we really get into the nitty gritty theory stuff, i think technically things don't actually touch..?
Dec 27 2010 9:09PM
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Stickity
Posts: 7750 - Karma: 769
woooooooooooo
Dec 27 2010 9:14PM
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McFellon
Posts: 1841 - Karma: 2,005
if we lived in the land of theoretical quantum physics, then this would be true. but due to the slight, but usually not even microscopic imperfections, nothing physical we have created, let alone a pvc pipe, is an actual circle, nor are skis perfect planes.
Dec 27 2010 9:14PM
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JRubes
Posts: 48 - Karma: 14
well maybe its not two lines where the skies make contact with the rail. Couldn't they technically be planes? Just really narrow planes... Or is that contradicting the whole perfect shapes thing?
Dec 27 2010 9:36PM
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terror.bear
Posts: 162 - Karma: 30
I like this guy =D
Dec 27 2010 9:52PM
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JRubes
Posts: 48 - Karma: 14
this may have been said already but i dont want to read through it all. But if you have both skis on a single barrel rail there is still width because the two lines of contact from your skis create width same way with a double barrel.
Jan 26 2011 9:58PM
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Stewie4
Posts: 858 - Karma: 139
Jan 26 2011 10:11PM
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JRubes
Posts: 48 - Karma: 14
if you read at least like the second post down you would have seen its a perfect world scenario. and on that note its like this ---|----|-----. the width of the ski makes the line rather than the length.
Jan 26 2011 10:14PM
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kootenayklaus
Posts: 3914 - Karma: 2,179
Contact point of a plane to a cylinder is a line. I know it's wider than a line.
Jan 26 2011 10:14PM
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Stewie4
Posts: 858 - Karma: 139
http://www.youtube.com/watch?v=IoVb6-s-wEA&feature=
Jan 26 2011 10:15PM
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