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Re: [ST] for Marc - (energy)



I'm just amazed that Emile is so right awake at 4am and can hold a physics 
class after a night of heavy drinking due to the first games of the Worls 
Cup. Emile you are a stud!

Z
----- Original Message ----- 
From: "Matthew Heyer" <matthewheyer@xxxxxxxxx>
To: <ST@xxxxxxxxxxxxxx>
Sent: Friday, June 09, 2006 7:24 PM
Subject: Re: [ST] for Marc - (energy)


> zzzzzzzZZZZZZZZZZzzzzzzzzzzzzzzzzzz.......
>
>
>
> ----- Original Message ----
> From: Emile Nossin <Emile@xxxxxxxxxx>
> To: ST@xxxxxxxxxxxxxx
> Sent: Friday, June 9, 2006 10:03:26 PM
> Subject: Re: [ST] for Marc - (energy)
>
>
>>From: Masiak, Richard
>>You forgot rotational acceleration.
>>It sounds like you're saying F=ma+(the v of your forward motion)
>>I'm not quite sure how many different components of "a" there
>>are, but I'm pretty sure I had a rotational acceleration component
>>added in there somewhere.
>>> From: Bruce Parker
>>> a simple high side will generate [your weight times the max height
>>> of the center of mass plus the energy of your forward motion].
>
> The V (speed) is not a force, speed is just a relative indicator of
> movement per time. When the speed changes (negative or positive
> acceleration), that's when the force comes in (F=MA).
>
> Your acrobatic stunt (sounds spectacular, must have been terrifying?)
> used the deceleration of the bike (difference in speed between you
> and the bike) to create the relative force to bring you over the
> handlebar. By holding on to it you vectored that force (acceleration)
> eventually downwards, adding it up to the acceleration by gravity.
>
> So in the vertical plane there was one vector of force, caused
> by two forces that are added up, which were caused by gravity
> and by your relative acceleration which you deflected downwards,
> times your mass. You're forward motion is still present, but won't
> really become a force untill you start decelerating (by hitting a
> wall or by scraping along the asphalt), which would be a force in
> the horizontal plane (horizontal vector).
>
> The complete and absolute forward motion only comes into play as a
> force into the asphalt if it would have been completely deflected
> towards the asphalt. In a highside a large part of the forward
> motion (but not all, otherwise it would drop dead still right
> after the highside) is indeed deflected suddenly straight into
> the asphalt (or whatever platform you're crashing into).
>
> So there's just one sort of acceleration, which can be positive
> or negative (deceleration) and can be pointed in any direction
> (and can therefor be split up into horizontal / vertical components,
> or vectors if you like).
>
> Emile
> www.piloot.com
>
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