Date: Mon Nov 19 12:23:56 2007

Author: Steve Wonnell

Subject: Re: Ping Pong Bazooka


Yes, if I recall correctly we used one or two 500-watt halogen lamps to
illuminate the scene. -- Steve W.

On Mon, 19 Nov 2007, Thomas J. Bauer wrote:

> writes:
> >Tom, that's great, much better for measuring the speed than the
> >one we used. To bad we didn't have a shorter shutter speed. -- Steve W.
> The first one I made was like yours with a 1/2000 of a second shutter
> speed and it is easy to see that the ball slows down after the collision
> with the can. It might be nice to use this for a conservation of momentum
> experiment instead of the old air pucks.
> My students also made a video of a ping pong ball going into a ballistic
> pendulum to determine the speed. They initailly got about 210m/s from the
> pendulum measurement and 240m/s from the video. They haven't done an
> uncertainty estimate yet. I like the ballistic pendulum because it ties
> together a lot of different concepts, but the old spring loaded gun seem
> more contrived than this.
> I liked the quality of your videos of the orange and water balloon. These
> were very good. You must have had some very bright lights. Our camera
> doesn't quite have that quality.
> Tom B