Re: [Phys-l] starting a swing

["Rick Tarara" <rtarara@saintmarys.edu>]

What is your definition of 'flat' here?  The normal 'operational' definition 
would be an equipotential (gravitational) plane.  ;-)

Rick


----- Original Message ----- 
From: "LaMontagne, Bob" <RLAMONT@providence.edu>


> If this is done in a very well constructed building with perfectly flat
> floors, then due to the curvature of the Earth, you will always start
> sliding toward the center of the structure.
>
> Bob at PC
>
> -----Original Message-----
> From: phys-l-bounces@carnot.physics.buffalo.edu
> [mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of chuck
> britton
> Sent: Monday, February 09, 2009 7:40 AM
> To: Forum for Physics Educators
> 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.