center of mass - Snowboarding Forum - Snowboard Enthusiast Forums
SnowboardingForum.com is the premier Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 02-21-2013, 05:48 PM   #1 (permalink)
Junior Member
 
Artu89's Avatar
 
Join Date: Nov 2010
Location: Poland
Posts: 8
Default center of mass

Hi,

what should I do to keep my center of mass over the edge? there shouldn't be too much inclination? I dont understand this concept... pls help
__________________
i apologize for my english
Artu89 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-21-2013, 07:25 PM   #2 (permalink)
Resident poet
 
wrathfuldeity's Avatar
 
Join Date: Oct 2007
Location: Bham
Posts: 3,722
Default

think of your board as the bottom of a cereal box...keep all your body parts inside the box. and the box does tilt...but generally your body...or really your mass/center of gravity is also tilted/aligned/stacked over the bottom of the cereal box
__________________
wrathfuldeity is offline   Reply With Quote
Old 02-22-2013, 08:02 AM   #3 (permalink)
Junior Member
 
Artu89's Avatar
 
Join Date: Nov 2010
Location: Poland
Posts: 8
Default

so suppose that my inclination during turn is 45 degree (i'm in the "box" so board's angulation is 45 too - center of mass over board) but i angulate the board by ankles by 2 degree. Probably center of mass is not over the board now? I have to increase inclination in this case to return center of mass over the board?

I know it might be too theoretical but i'm curiouse about it

Is it possible to be stable in the turn when my mass center isnt over working edge?

And how center of mass is related to centrifugal force?
__________________
i apologize for my english

Last edited by Artu89; 02-22-2013 at 08:09 AM.
Artu89 is offline   Reply With Quote
Old 02-22-2013, 08:26 AM   #4 (permalink)
-LIFETIME MEMBER-
 
crash77's Avatar
 
Join Date: Jan 2011
Location: Baltimore, MD
Posts: 309
Default

Uh..umm..
crash77 is offline   Reply With Quote
Old 02-22-2013, 09:11 AM   #5 (permalink)
Resident poet
 
wrathfuldeity's Avatar
 
Join Date: Oct 2007
Location: Bham
Posts: 3,722
Default

Quote:
Originally Posted by Artu89 View Post
so suppose that my inclination during turn is 45 degree (i'm in the "box" so board's angulation is 45 too - center of mass over board) but i angulate the board by ankles by 2 degree. Probably center of mass is not over the board now? I have to increase inclination in this case to return center of mass over the board?

I know it might be too theoretical but i'm curiouse about it

Is it possible to be stable in the turn when my mass center isnt over working edge?

And how center of mass is related to centrifugal force?
umm...idk...but you also are probably lowering your cog because you are squating instead of standing straight legged....so the relative position or angle to pressure the edge is different. I'd imagine also you are entering and exiting the box and angle differently using cross under turns vs cross over turns and the angle of attacking the snow/fall line is going to be more parallel with the fall line...instead of transversing it.

....its kind of using 4 dimensional space....x, y, z and moving/time/speed instead of your above perspective which seems more 2 dimensional.
__________________

Last edited by wrathfuldeity; 02-22-2013 at 09:18 AM.
wrathfuldeity is offline   Reply With Quote
Old 02-22-2013, 09:40 AM   #6 (permalink)
Drunk with power...er beer.
 
Donutz's Avatar
 
Join Date: May 2010
Location: Vancouver, BC, Canada
Posts: 4,536
Blog Entries: 214
Default

If you draw a line from your center of mass - which is usually just behind the belly button -- through the center of the board, that'll give you the vector at which the board is pushing against the Earth. Assuming you're balanced of course. If you just lean over while standing still, you'll just fall over. The amount of lean should just balance the "centrifugal force" so that you stay on your board through the turn. Angling the board is an additional complication. It doesn't affect center of mass or the angle of the vector, but it does affect whether or not your board is able to hold you in the turn. Put the board too flat and you'll slide out.

Of course there are things you can do to affect your center of mass. For instance, sticking your arms out in front of you will shift your center of mass forward, requiring more lean. Squatting will shift your center of mass back.
__________________

I hate the parts between winter
Donutz is offline   Reply With Quote
Old 02-22-2013, 10:01 AM   #7 (permalink)
-LIFETIME MEMBER-
 
crash77's Avatar
 
Join Date: Jan 2011
Location: Baltimore, MD
Posts: 309
Default

This is interesting because I couldn't explain this technically and scientifically speaking if I wanted to, but I can feel everything that is being explained above through the board and my body every time I ride. It's like a conversation of relativity between the two.
crash77 is offline   Reply With Quote
Old 02-22-2013, 02:09 PM   #8 (permalink)
Junior Member
 
Artu89's Avatar
 
Join Date: Nov 2010
Location: Poland
Posts: 8
Default

thx guys for replies

The last question:

Here:


mass center is over the edge, otherwise it would be wipeout?
__________________
i apologize for my english

Last edited by Artu89; 02-22-2013 at 02:14 PM.
Artu89 is offline   Reply With Quote
Old 02-22-2013, 02:43 PM   #9 (permalink)
-LIFETIME MEMBER-
 
Join Date: Feb 2013
Posts: 27
Default

He's probably going fast enough so the centrifugal forces outweigh the force of the gravity. (Did this come out right? )

It's the same as those MotoGP riders when they're hanging all the way into their turns. One little slip and you're on the ground though.
Vinh is offline   Reply With Quote
Old 02-22-2013, 03:56 PM   #10 (permalink)
-LIFETIME MEMBER-
 
crash77's Avatar
 
Join Date: Jan 2011
Location: Baltimore, MD
Posts: 309
Default

MotoGP is the shit! Can't wait for this season...Rossi back on a Yami!
crash77 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 05:45 AM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2
VerticalSports
Baseball Forum Golf Forum Boxing Forum Snowmobile Forum
Basketball Forum Soccer Forum MMA Forum PWC Forum
Football Forum Cricket Forum Wrestling Forum ATV Forum
Hockey Forum Volleyball Forum Paintball Forum Snowboarding Forum
Tennis Forum Rugby Forums Lacrosse Forum Skiing Forums