Re: [Phys-l] starting a swing

[Jack Uretsky <jlu@hep.anl.gov>]

	I'm not sure that this observation, if true, helps understand 
starting a swing.
			Regards,
				Jack




On Mon, 9 Feb 2009, Eric Lane, Lane wrote:

> But you can still change your orientation even
> If there is absolutely NO static or kinetic friction!
>
> -----Original Message-----
> From: chuck britton <britton@ncssm.edu>
> To: Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu>
> Date: Mon, 9 Feb 2009 07:40:05 -0500
> Subject: Re: [Phys-l] starting a swing
>
> If there is absolutely NO static or kinetic friction - then the CM of
> the you+cardboard cannot move.
>
> If there is a touch of static friction  - then any three year old can
> easily cruise across the room.
>
>
>
> On Feb 9, 2009, at Feb 9(Mon) 7:28 , Brian Whatcott wrote:
>
> > Stefan Jeglinski wrote:
> > > > Here is a somewhat analogous situation.  You are standing on a
> > > > large sheet
> > > > of cardboard on a perfectly smooth floor.
> > >
> > > Is that a euphemism for frictionless, I assume?
> > >
> > >
> > > >   Take the cardboard as massless.
> > > > Can you change your location on the floor?
> > >
> > >
> > > Stefan Jeglinski
> > I hope someone disembarasses me soon of what seems to be the obvious
> > response,
> > which is....      Yes, Of COURSE you can change position.
> >
> > Brian W
> > _______________________________________________
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>
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>
> Prof. Eric T. Lane   eric-lane@utc.edu
> Physics Dept. 2352  423-265-7804
> The University of Tennessee at Chattanooga  37403-2409
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