Re: [Phys-l] starting a swing

[chuck britton <britton@ncssm.edu>]

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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