Re: [IAEP] Gravity for Beginners...
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-FeDXZGd2MnN0ODJfMjAwNmc0NHF4ZHIhl=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
Re: [IAEP] SoaS change of direction: heads-up on convos in other lists
I'm sorry Caryl, I'm the moderator of the marketing list, but I haven't been able to access the admin page for a few weeks due to a technical problem so I can't pass messages through. I've communicated with Bernie (systems list) about this issue. Sean On Sat, Mar 20, 2010 at 8:49 PM, Caryl Bigenho cbige...@hotmail.com wrote: Hi... Some of us are blocked from posting on the Marketing List, I think that is how it got divided. Luke has some great ideas here... From: l...@faraone.cc To: cbige...@hotmail.com CC: martin.langh...@gmail.com; pbrobin...@gmail.com; m...@melchua.com; market...@lists.sugarlabs.org; iaep@lists.sugarlabs.org; i...@solarsail.media.mit.edu; s...@sugarlabs.org Date: Sat, 20 Mar 2010 13:51:24 -0400 Subject: Re: [IAEP] SoaS change of direction: heads-up on convos in other lists On Sat, Mar 20, 2010 at 13:40, Caryl Bigenho cbige...@hotmail.com wrote: OK. Let's focus a bit here. In the spirit of IAEP, I wonder who this version of SoaS will be for... educators and students or developers? It seems like the discussion is favoring the latter. That would be a big disappointment to those of us who are waiting to have a good stable version to share with the education community. Sounds to me like it's for deployers, people looking to make derivatives of SoaS. As Silbe said, there are tools for building new images with more activities. On the other hand, it would be useful to have an all inclusive version of SoaS for instant-on usage of the system. Or, better, to have it be incredibly easy to download from ASLO activities that have been tested and QAd, and to have these activities widely promoted on the page. Yes! this would be wonderful! Could it be done before April 24? (I can dream can't I?). Caryl -- Luke Faraone http://luke.faraone.cc ___ 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
[IAEP] is Soas safe?
My apologies for this silly, silly question. I am concerned of the risk of malware infection in shared machines. I guess that harddrive-less units are totally OK, but what happens in normal, hard-drive based machines if somehow a stick gets infected? when booting from a USB stick, is it like when booting from a CD or for those old enough to remember, like booting from a floppy? I mean, that was THE way to get infected before Word macros started being the star, since such infection basically bypass all anti-malware protection, except when set at the BIOS level, and how many people knew about it in my younger days? How can we ensure this is not an issue made worse by Soas users? Opinions and knowledge, anyone? Thanks! Yama ___ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
Re: [IAEP] is Soas safe?
[please drop iaep in followup emails, this is a technical discussion] On Sun, Mar 21, 2010 at 19:31, Yamandu Ploskonka yamap...@gmail.com wrote: I guess that harddrive-less units are totally OK, but what happens in normal, hard-drive based machines if somehow a stick gets infected? when booting from a USB stick, is it like when booting from a CD or for those old enough to remember, like booting from a floppy? I mean, that was THE way to get infected before Word macros started being the star, since such infection basically bypass all anti-malware protection, except when set at the BIOS level, and how many people knew about it in my younger days? How can we ensure this is not an issue made worse by Soas users? Opinions and knowledge, anyone? The operating system running on the SoaS stick has unrestricted access to the computer. It can mount internal disks, repartition, etc; anything one could do if you were root on the running computer. So far, the only security vulnerability experienced in conjunction with USB sticks has been Windows viruses. Since the SoaS stick does not contain WINE, it cannot run any Windows executables, and unless a virus is specially crafted to work on Linux and handle the specific way that LiveUSB sticks are constructed, it is unlikely to pose any threat. There is no way to mitigate this threat other than to verify the integrity of a SoaS stick from a trusted (ideally sole-role) computer designed for that purpose, or have the BIOS check the kernel signature (a la the XO), and have the kernel verify the userland. This is overkill for 99% of situations. In summary: There are much more probable threats to be worried about, and as of today, SoaS does not have the level of popularity where one would have to consider such solutions. If we want to protect against rouge activities, there are existing technologies that can easily be put into place with a configuration change (`touch /etc/olpc-security`) and some testing. This is a good thing to work on short-term in my opinion. Thanks, Luke Faraone http://luke.faraone.cc signature.asc Description: OpenPGP digital signature ___ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
