squeakland May 2003

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27 participants
40 discussions

Math expressions with project attached
by pierre-andre.dreyfuss＠edu.ge.ch 05 May '03

05 May '03

Sorry I forget to attach the project. -----Message d'origine----- De: Dreyfuss Pierre-Andr? (EDU) A: 'squeakland(a)squeakland.org' Date: 22.04.03 16:47 Hi everybody, I have made a project for teaching math expressions It is like a super spreadsheet, You can build any expression and see the result for any part and of course for the expression itself. Using watchers for the variables: expr (the expression )and res (the expression with the result )you can see the corresponding math notation. (Just extra parenthesis are not removed.). The expression is built using Holders. Each holder must have three items left part, operator, right part. In the operators, you have the result of the operation. Left and right parts can be either a number or an expression. That's all play with it . Some scripts are written in smallTalk since two primitives are missing as tiles: 1.- The number of objects in a holder: self costume submorphs size 2.- The , to concatenate strings. Best Regards P-A Dreyfuss.

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No subject
by pierre-andre.dreyfuss＠edu.ge.ch 05 May '03

05 May '03

Hi everybody, I have made a project for teaching math expressions It is like a super spreadsheet, You can build any expression and see the result for any part and of course for the expression itself. Using watchers for the variables: expr (the expression )and res (the expression with the result )you can see the corresponding math notation. (Just extra parenthesis are not removed.). The expression is built using Holders. Each holder must have three items left part, operator, right part. In the operators, you have the result of the operation. Left and right parts can be either a number or an expression. That's all play with it . Some scripts are written in smallTalk since two primitives are missing as tiles: 1.- The number of objects in a holder: self costume submorphs size 2.- The , to concatenate strings. Best Regards P-A Dreyfuss.

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"All the Real Math To Which School (Including College) Refuse d Yo u Access."
by G.J.Tielemans＠dinkel.utwente.nl 05 May '03

05 May '03

thanks, i try to remember this -----Oorspronkelijk bericht----- Van: Alan Kay [mailto:Alan.Kay@squeakland.org] Verzonden: maandag 21 april 2003 21:56 Aan: squeakland(a)squeakland.org Onderwerp: RE: "All the Real Math To Which School (Including College) Refuse d Yo u Access." Actually, what the 10 and 11 year olds do is: 1. measure from the bottom of a ball to the bottom of the ball in the next frame using the height of a rectangle that is stretched to fit. 2. They stack up the rectangles to see that the incremental change in height is constant. They know this is constant accelleration because they have played with it using their painted cars a few months previously. 3. they paint a small simulated ball 4. they then adapt the script they wrote for the cars to drop the ball in the vertical direction with constant accelleration: 5. ball drop ticking ball's speed increase by -1 ball's y increase by ball's speed 6. then they tinker with the constant to find the accelleration that matches what is happening in the movie 7. Then they figure out a way to "prove" that they have "captured gravity" a. one way is to leave a little mark at each position of the real ball b. another way is to run the movie and their simulation frame by frame to show that the simulated ball tracks the movie In other words, these children actually derive the dynamic relationship of (very near) constant accelleration near the surface of the earth in the form of a discrete 2nd order differential equation. It is quite remarkable to see this (especially for me, since I designed this project for 9th through 12th graders). The key here is to spread out the various ideas and parts that have to be learned over several months in the midst of doing other things. Cheers, Alan At 7:25 PM +0200 4/21/03, G.J.Tielemans(a)dinkel.utwente.nl wrote: >Yes Alan, falling object on movieframes: I saw something the same with eggs >from Mark Guzdial on Georgia Tech. But where are the >student-created-time-connected-graphs? > >-----Oorspronkelijk bericht----- >Van: Alan Kay [mailto:Alan.Kay@squeakland.org] >Verzonden: maandag 21 april 2003 0:08 >Aan: squeakland(a)squeakland.org >Onderwerp: RE: "All the Real Math To Which School (Including College) >Refuse d Yo u Access." > > > >--- >Incoming mail is certified Virus Free. >Checked by AVG anti-virus system (http://www.grisoft.com). >Version: 6.0.474 / Virus Database: 272 - Release Date: 18-4-2003 > >--- >Outgoing mail is certified Virus Free. >Checked by AVG anti-virus system (http://www.grisoft.com). >Version: 6.0.474 / Virus Database: 272 - Release Date: 18-4-2003 > -- --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.474 / Virus Database: 272 - Release Date: 18-4-2003 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.474 / Virus Database: 272 - Release Date: 18-4-2003

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"All the Real Math To Which School (Including College) Refuse d Yo u Access."
by G.J.Tielemans＠dinkel.utwente.nl 05 May '03

05 May '03

Yes Alan, falling object on movieframes: I saw something the same with eggs from Mark Guzdial on Georgia Tech. But where are the student-created-time-connected-graphs? -----Oorspronkelijk bericht----- Van: Alan Kay [mailto:Alan.Kay@squeakland.org] Verzonden: maandag 21 april 2003 0:08 Aan: squeakland(a)squeakland.org Onderwerp: RE: "All the Real Math To Which School (Including College) Refuse d Yo u Access." --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.474 / Virus Database: 272 - Release Date: 18-4-2003 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.474 / Virus Database: 272 - Release Date: 18-4-2003

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A seemingly trivial task!
by jaford＠watford53.freeserve.co.uk 05 May '03

05 May '03

Hi, As a start to a simulation of the transition of states of matter from solid to liquid to gas, I want to make an object (molecule) jiggle about a given x y point. Using tiles, I've tried: Ellipse heading Random 180 (I would expect Random 180 to return an integer between 1 and 180, but it doesn't - it returns -180 to +180, but it produces the right effect!) Ellipse forward 10 Ellipse heading 180 (to point back where it came from) Ellipse forward 10 (to return to the starting x y) What actually happens is that the object rotates randomly (as wanted) about a fixed point - but the 'Ellipse forward 10' statements don't get executed at all. Is there some preprocessing going on that decides that the net moves are nill, so the Ellipse is not moved at all (like curses iirc)? If so, how do I get round it (using tiles), please? I've tried inserting delay loops at strategic points to attempt to thwart this, also 'Ellipse forward -10' instead of rotating it 180, but the preprocessor's smarter than I am!. Regards: Jim Ford

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etoy issues/making games and mazes
by Kim.Rose＠viewpointsresearch.org 05 May '03

05 May '03

-- Hi, In repsonse to recent email queries about making mazes/and creating scripts with feedback, I direct you to the "project swiki" that is part of the Squeakland site: http://www.squeakland.org:8080/super/gallery If you specifically check out the "Robot car in Maze" and "Sensor Car" projects you can see by using a conditional/test tile and the "color sees" tiles you can make a simple feedback script by just using "forward by" and "turn by" tiles. What's great in this kind of project is the kids need to think about the direction of their object's heading and if the object needs to turn left or right to keep on the course and therefore they need to think about using positive or negative numbers. This is very simple and does not even require thinking about x or y coordinates. (We introduce that later.) The kids LOVE making all kinds of variations of mazes and games. By the way, *any* of you can and are welcome to publish/post your examples to this Project Gallery/Swiki. To do this, hold down the "Publish" button on the gold navigator bar and select, "Publish to another server". After you have named the project you wish to share, you'll get a directory in a blue window. Selecting "Squeakland BSS" will publish your project to this page on the Squeakland site. We'd love to see more examples here! I hope these examples help! have fun, Kim

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Pendulum
by Brucestro＠aol.com 05 May '03

05 May '03

Andreas/Phil, Wouldn't another possilble approach be to create a series of pictures showing all the possible positions of the pendulum and then control it as one would control a cartoon/movie? (Phil - There are examples of this technique at squeakland.org under the eToys link.) Another option that comes to mind is to stack each of these pictures on top of each other and move them front to back as required. Andreas, I'm new to Squeak -- would these ideas work, or am I on the wrong track? Thanks, Bruce Strothenke Teachers College Columbia University

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Where is Croquet mailing list?
by jaford＠watford53.freeserve.co.uk 05 May '03

05 May '03

Hi, I've searched for the Croquet mailing list that Allen Kay mentioned previously, but I can't find it. The only other Squeak related list I've found (other than this one) is the squeak-dev one. Pointers anyone, please? Regards: Jim Ford

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Fwd: More advocacy around Math + Computers in K-12
by dajoy＠openworldlearning.org 05 May '03

05 May '03

This is somehow related to the Pendulum thread and to what Squeak might be trying to accomplish: http://www.mathforum.org/epigone/math-teach/whaiflaldkrir Daniel

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New mailing list system
by m.rueger＠acm.org 05 May '03

05 May '03

Hi all, we finally switched over to the new mailing list system on Squeakland. The new system has a web interface and allows you to set a number of options regarding your subscription. As most of you already noticed, it also sends out a reminder of your membership every month in case you forgot :-) We moved all the existing subscriptions over to the new system. We strongly encourage you to set a password so only you can change your subscription options. Below is an example of the subscription notification you would normally receive including all the "interesting" links. The archive is now at http://squeakland.org/pipermail/squeakland/ Please let me know if you have any questions or encounter any problems with the new system. Michael -------------- Welcome to the Squeakland(a)squeakland.org mailing list! To post to this list, send your email to: squeakland(a)squeakland.org General information about the mailing list is at: http://squeakland.org/mailman/listinfo/squeakland If you ever want to unsubscribe or change your options (eg, switch to or from digest mode, change your password, etc.), visit your subscription page at: http://squeakland.org/mailman/options/squeakland/xxxxxxx if you email address is, e.g., squeak(a)mail.com, the above line would be http://squeakland.org/mailman/options/squeakland/squeak%40mail.com (The "@" is replaced by "%40") You can also make such adjustments via email by sending a message to: Squeakland-request(a)squeakland.org with the word `help' in the subject or body (don't include the quotes), and you will get back a message with instructions. You must know your password to change your options (including changing the password, itself) or to unsubscribe. It is: xxxxx Normally, Mailman will remind you of your squeakland.org mailing list passwords once every month, although you can disable this if you prefer. This reminder will also include instructions on how to unsubscribe or change your account options. There is also a button on your options page that will email your current password to you.

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squeakland May 2003