[ODE] Values required to produce at leastsemi-realisticfrictionusing the default constant-force-limit model?

[George Birbilis]

indeed, it's how you interpret the word "rolling" - from your newer sayings
I suppose you meant both angular+linear velocity <>0

cheers,
George

----- Original Message ----- 
From: "Steve Baker" <...>
To: "George Birbilis" <...>
Sent: Wednesday, March 17, 2004 2:12 AM
Subject: Re: [ODE] Values required to produce at
leastsemi-realisticfrictionusing the default constant-force-limit model?


> George Birbilis wrote:
> > my feel is that a rolling sphere (with a torque at an axis passing
through
> > the sphere center and parallel to the horizontal plane), won't move if
> > there's no friction with the ground. It will keep spinning at the same
place
> > (unless it had some linear velocity too)
>
> Newtons' first law.  An object in a state of motion continues in that
state unless
> an external force is applied.  In this case, friction is the only net
force - and
> if it's zero, the object will keep doing whatever it was doing.
>
> If it's stationary - and you apply torque to start it spinning, it would
indeed
> sit there without moving if there was no friction.
>
> However, if it's already moving along whilst spinning - if you give it a
push to
> start it moving, it'll continue moving along and spinning indefinitely.
>
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