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Put a grid behind that and let the visitor decide the measurement.  BUT I think the problem may be in getting a full view path and as normal to the path as possible for the truest image. In other words not looking up, down or sideways.


---- Barry Moore <[log in to unmask]> wrote: 
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
> 
> 
> Scott,
> 
>  
> 
> You may be able to develop an exhibit using a strobe flash and simple camera with a long exposure connected to a TV monitor.
> 
>  
> 
> Have a look at this image of mine for instance.
> 
>  
> 
> http://www.pbase.com/barry_2718/image/92643503
> 
> 
> 
> Kind Regards Barry Moore, Operations Manager Wollongong Science centre and Planetarium, Australia
> 
> Email [log in to unmask] (Personal and Toastmasters); [log in to unmask] (Professional)
> Photo galleries at http://www.pbase.com/barry_2718
> My Quote: "A photograph is no substitute for the experience but memories fade and digital photographs don't"
> 
> 
> 
>  
> > Date: Sat, 29 Aug 2009 10:33:28 +1000
> > From: [log in to unmask]
> > Subject: Re: Bouncing ball exhibit
> > To: [log in to unmask]
> > 
> > ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> > Incorporated, a worldwide network of science museums and related institutions.
> > *****************************************************************************
> > 
> > Scott,
> > 
> > might not be what you are looking to achieve, however
> > 
> > like Galileo I'd suggest you could run the experiment on an inclined plane.
> > have the ball on a track ( pair of rails etc), with the ball captive between the rails.
> > Have a finger slot to allow them to push it up hill, and release.
> > 
> > having it on the slope slows it all down, so your sensor system has a bit more 
> > precision ( ultrasonics are good, bit can be a little slow - sound only goes so fast).
> > 
> > It also means the ball is held in a very defined path so your sensors don't have to deal with the ball following different
> > paths on each bounce.
> > 
> > I;ve seen and used a range of sensors. video capture could work with a bright coloured ball as target, but 
> > with simple cameras you're limited to 25/30 fps, ( so in a 0.5 meter drop you'd get around 8-10 samples) so you might need to run it on a ramp to slow it down and get enough points.
> > 
> > parallax ping ultrasonic sensors are faster and you might get 50 to 100 samples a second.
> > there are some good cheap optical range sensors that would work at about 100 plus samples a second, but not on a steel ball.
> > 
> > and you could run a set of photo gates.
> > 
> > if you used a steel ball ( and steel plate to bounce it off), you could use and electromagnet ( either fixed or slidable along the track) and use the 
> > release of the electromagnet to sync/start the data capture.
> > 
> > 
> > Just some thoughts.
> > 
> > Stuart Kohlhagen
> > Director Research and Development
> > Questacon
> > The National Science and Technology Centre
> > Canberra
> > 
> > 
> > 
> > 
> > ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> > Incorporated, a worldwide network of science museums and related institutions.
> > *****************************************************************************
> > 
> > We are considering developing an exhibit activity where visitors bounce
> > balls and see the bouncing motion graphed in real time. The goal of the
> > activity would be for the visitors to use the mathematical
> > representation of the motion to compare how different types of balls
> > bounce.
> > 
> > Has anyone developed or seen an exhibit related to this? We are
> > especially interested in how others have dealt with the issue of loose
> > versus contained balls. Loose balls are a nightmare but a mechanical
> > reset option might be equally as challenging.
> > 
> > Thanks for your help!
> > 
> > Scott
> > 
> > 
> > Scott Pattison
> > Senior Exhibit Developer
> > Oregon Museum of Science and Industry
> > 1945 SE Water Ave
> > Portland, OR 97217
> > 503.797.4673
> > [log in to unmask]
> > www.omsi.edu
> > 
> > 
> > 
> > Crack the Case - CSI: The Experience now on exhibit May 23-Sept. 15
> > 
> > 
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