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help me w/ski related homework

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1080ski
Posts: 4424 - Karma: 191
i have a physics project and i need to find the initial velocity (horizontal and vertical), final velocity (horizontal and vertical), the time, and the distance traveled. so if anybody could find this and maybe a pic (one w/multiple frames of a person in a jump), that would be good. it can be a park jump or one of those really long jumps. if you could look around, that would be great.
Dec 1 2004 6:49PM
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skiingpimp
Posts: 1176 - Karma: 31
check video shit.
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Dec 1 2004 6:50PM
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1080ski
Posts: 4424 - Karma: 191
i need real statistics with sources though...
Dec 1 2004 6:52PM
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dylhole
Posts: 2925 - Karma: 939
look in your physics book
Dec 1 2004 7:01PM
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CORKED
Posts: 320 - Karma: 16
look at a video and guess. bullshit, it works. just be close to real values.


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E.T. is the can-do alien, and don't you forget it
Dec 1 2004 7:09PM
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Dakoulas
Posts: 2894 - Karma: 40
Here I'll bull shit for you. For initial velocity do like 35 mph on a 25 degree pitch, I don't know what the horizontal and vertical velocitys would be and it has been too long since I have done physics so I don't feel like finding out but if I remember right it is pretty simple. So ya 35 for initial, maybe like 3-4 seconds from right before he hits the tranny of the jump to the landing. I would just throw out a distance of like 45-55 feet from the tranny to the landing, and I donno maybe 25 mph on a 35 degree pitch for the landing.
I don't know if that helped you much but I figured I'd try. And for a pic just look on Freeze or Freeskier for a sequence of a 40-50 footer, I am sure there are plenty.

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Dec 1 2004 7:16PM
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Pklink04
Posts: 5608 - Karma: 392
oh are you trying to do a vector quantity



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Dec 1 2004 7:19PM
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1080ski
Posts: 4424 - Karma: 191
uh... vector quantity? we havent done angles yet, just need enough for V v T graphs and D v T graphs (vertical and horizontal). btw, thanks to whoever just put abunch of that stuff up there. i can make up a distance or a time in the air. thanks! does anybody know how to convert mph into m/s?
Dec 1 2004 7:33PM
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$$SPINNERS$$
Posts: 1618 - Karma: 11
use the problem shane mconckey uses in yearbook

roles royce is a car to be driven in, bentley is a car to drive

saying that something is so hot right now is so hot right now
Dec 1 2004 8:02PM
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Dakoulas
Posts: 2894 - Karma: 40
mph to meters per second. First you would divide by 360. Then you would multiply by 5280(ft in a mile) and then divide by 3.6 or something(however many feet a meter equals.
I am nto sure if that is right since it has been over a year since I have done it and can't rememebr it off the top of my head.

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Dec 1 2004 8:18PM
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SkiCA
Posts: 247 - Karma: 33
I did a physics assignment that we had to figure how much snow we melted on the way down, and a whole bunch of other crap, but that was the only interesting thing I remembered
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Dec 1 2004 9:14PM
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SchweitzerSki
Posts: 4479 - Karma: 11
do you have sci tools in your calulator? please say you do. you can convert using that.
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Dec 1 2004 9:17PM
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j.bird
Posts: 6680 - Karma: 15
You would not be able to do it, unless you were present or the following info was given to you:

-avg angle of slope
-coeffecient of friction
-mass of skier plus clothes and gear
-wind resistance
-naturl wind direction

and a bunch of other shit, unless you want to neglect these, but these are actually HUGE factors in determining this.

Then you need the formulas for finding all of these. A good hour of calculating, even if the info was just given to you/
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Dec 2 2004 12:15AM
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jack_tha_ripper
Posts: 2057 - Karma: 11
wow. that shit looks really hard
Dec 2 2004 2:59AM
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221
Posts: 3488 - Karma: 11
are you talking about skiing on the slope or flying through the air? It sounds like you want to keep it simple. Things like wind resistance are often left out for simplicity and you can still get a reasonable %error. for skiing on a slope, google shit like 'friction equations', make some assupmtions and work it out. For flying through the air, look for 'projectile motion equations' etc.

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Dec 2 2004 9:04AM
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eastAR5
Posts: 15084 - Karma: 730
hold on, i'll post my Physics of Newschool Skiing essay when i find it.





Park Life
Dec 2 2004 9:15AM
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Justo8484
Posts: 3905 - Karma: 204
there was actually something like that in my physics book back in high school. but that was 11th grade, and i'm a college sophomore now, so i dont exactly remember what it said
Dec 2 2004 11:48AM
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