Re: [Phys-l] balloon floating in air in car

["Richard A. Lindgren" <ral5q@virginia.edu>]

Hello,
Another variation. How about a helium filled balloon floating  gently up 
against the roof in the back seat of your car. What happens when the car 
accelerates forward?
Richard at UVa

On Tue, 21 Apr 2009 11:25:39 -0400
 "LaMontagne, Bob" <RLAMONT@providence.edu> wrote:
> Obviously the ball goes up with the elevator.
>
> Bob at PC
> ( mg = rho g V,  g increases on both sides of the equation, so V doesn't 
> change?)
>
> -----Original Message-----
> From: phys-l-bounces@carnot.physics.buffalo.edu 
> [mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Anthony 
> Lapinski
> Sent: Tuesday, April 21, 2009 8:38 AM
> To: phys-l@carnot.physics.buffalo.edu; tap-l@lists.ncsu.edu
> Subject: [Phys-l] ball floating in elevator
>
> A ball is floating in a beaker of water in an elevator. What happens to
> the ball when the elevator accelerates upward? Good question for your
> "bright" students!
>
> Think about this before checking out the video below.
>
> http://www.youtube.com/watch?v=OXuYWCWIaJI
>
> I guess you could demonstrate an elevator accelerating downward -- free
> fall -- by dropping a (plastic) beaker above a garbage pail to see what
> the ball does while falling. Might be hard to observe this fast motion, so
> a video camera would be useful.
>
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Dr. Richard A. Lindgren
Research Professor of Physics and
Director of Masters of Arts in Physics Education Program
Institute of Nuclear and Particle Physics
Department of Physics
University of Virginia
P.O. Box 400714
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email  ral5q@virginia.edu