Thanks! I'll let you know how it goes.
On Sat, Mar 20, 2010 at 6:05 PM, Alan Kay <alan.n...@yahoo.com> wrote: > You can do the overlays in Etoys by using its paint tool to paint out (using > transparent paint) the middle of the frames so the others will show through. > > Also take a look at http://www.vpri.org/pdf/rn2005001_learning.pdf which > shows this, and another way to do the measuring by putting frames side by > side and using the height of translucent rectangles to do the measuring. > > There are several key techniques here to keep in mind, even with high school > students. One is the "7 + or - 2" principle of not trying to jam too many > ideas at once into the > > For the 5th graders we did fun and games with speed and acceleration several > months before dropping objects off the roof of the school. The kids used the > translucent rectangles here to get some visual memories of these ideas. > (Both Newton and Einstein like to do math first -- to provide concepts and > vocabulary -- before looking at the physical world. > > The translucent rectangles also help a lot with measuring errors (and the > fact that you only have pixels, and there is some motion blur in the > videos). > > What you want is for the differences that are clearly shown when the > translucent rectangles are overlaid should look to be of constant size > ("pretty nearly" as Newton would say). This gives rise to the hypothesis of > constant acceleration, which is then tested by making a simulation with > constant acceleration and finding some way to see if the video and the > simulation match up. The 10 year olds found some good ways to do this. > > If the kids could really measure accurately, they would find that the > acceleration is not actually constant, but differs by about one part in a > million from 14 feet above the ground and at the ground level (due the more > accurate inverse square Newton "Law"). > > Please don't hesitate to ask questions. > > Cheers, > > Alan > > ________________________________ > From: Walter Bender <walter.ben...@gmail.com> > To: Jeff Elkner <j...@elkner.net> > Cc: iaep@lists.sugarlabs.org > Sent: Sat, March 20, 2010 12:41:01 PM > Subject: Re: [IAEP] Gravity for Beginners... > > kino will let you export your movie as a series of stills... I am sure > there are many Free multimedia programs with a similar capability. > > regards. > > -walter > > On Sat, Mar 20, 2010 at 3:17 PM, Jeff Elkner <j...@elkner.net> wrote: >> Hi All, >> >> I'm working on a derivative version of "Gravity for 10 Year Olds" to >> use with my high school age students, which I'm calling "Gravity for >> Beginners": >> >> >> https://docs.google.com/Doc?docid=0ARq50A7-FeDXZGd2MnN0ODJfMjAwNmc0NHF4ZHI&hl=en >> >> Day 2 has the following: >> >> "Show the students how to overlay frames from their videos to get this >> effect:" >> >> Can anyone point me to easy instructions on how to do this? I can't >> really use the lesson without it. >> >> Thanks! >> >> jeff elkner >> _______________________________________________ >> IAEP -- It's An Education Project (not a laptop project!) >> IAEP@lists.sugarlabs.org >> http://lists.sugarlabs.org/listinfo/iaep >> > > > > -- > Walter Bender > Sugar Labs > http://www.sugarlabs.org > _______________________________________________ > IAEP -- It's An Education Project (not a laptop project!) > IAEP@lists.sugarlabs.org > http://lists.sugarlabs.org/listinfo/iaep > > _______________________________________________ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep