Mousetrap Cars - Any advice?

by Admin 7. January 2008 01:18

I have to get 7 cub scouts started tonight on creating a mousetrap car. This is in addition to the pinewood derby car they are already working on, and some are working on LEGO robotics creations as well.

I've Googled it, bought some supplies (but still don't have the mousetraps), but lack any real practical experience in doing this myself.

Anyone done this before and have some words of wisdom/warning?

Celestron - LCD Digital Microscope (LDM)

by Admin 4. January 2008 13:12

celestron_microscope

I've been looking for a microscope for home (for mostly Biology stuff) but you always seem to have to choose between what is basically a cheap plastic toy, an older-style optical model with no built-in lights (let alone a digital camera) or some really expensive "C.S.I." type unit that is clearly overkill.

Perhaps this (available in February 2008) model will be the happy compromise I've been looking for.  Its 40-400x (nice range for lots of Bio stuff), has top and bottom LED illumination (some things show details better reflecting light, some are better when light comes through them), six color filters, a 2MP digital camera built-in, USB connection to a computer, a 3.5" LCD screen, an SD Card Slot (so you could take it out to a site, take pics, and come back home - but you'd need power at the site (maybe a battery pack will emerge?)).

Downside, there is no option to use optics-only - and as much as capturing your findings is cool, your eye is way higher resolution than 2MP so some details will be lost (wonder if it does video - imagine capturing a cell dividing, that'd be cool).  The screen sure looks like a design after-thought - wonder if it detaches or something? And $300 is still expensive.  I'll wait for the first reviews to come in (and hopefully more/better pictures of the unit), but it might be something nice to start with in the fall.

Celestron.com/Microscopes/LCD Digital Microscope (LDM)

MS Math Add-In for Word 2007

by Admin 30. November 2007 09:14

I wont spend much time rehashing this because Chris does a great job of it in his post, but there is a Add-in for Word 2007 that does much more than just equation editing.

And you thought "spell check" was cool - now there is "math check".

It will simplify the equation, graph it, and even solve for "x" (multiple roots for polynomials).

Check out the article and the get the Add-in here.

MS Math Add-In for Word 2007 - Marquee de Sells: Chris's insight outlet

Howtoons: The Possibilities Are Endless!

by Admin 29. October 2007 00:25

I had forgotten that I preordered this book from Amazon but it came in the mail on Friday and I read through it over the weekend (also got a LEGO Droid Development kit off an eBay auction, but that is another story).

The Howtoons book is really well done.  You can get a basic idea of the premise of the book by visiting the Howtoons site online or looking through some back issues of Make magazine.  But basically it is a creative way (comics with a story) of getting kids actively involved in working on hands-on science and construction projects.

howtunesbook

One of the things that was a very positive surprise about the book, was that the book was not just a recap and compilation of their existing strips (which would have been worth the price anyway).  They also got into the whole "background story" of what helps enable kids to be creative and constructive.  There are a number of pages written (and drawn) to promote the idea of kids having a "workshop" (or just a workbench) where they can work on projects, and where a little bit of paint or glue would just "add character" to the place rather than "mess it up".   They also cover building up a good "tool bucket" and have a nice section on making and using protective eyewear for safety. 

On top of that there are some great projects to build.  The Marshmallow Shooter that we did this summer is in there.  Also there are bigger projects like the pop-bottle-water-rocket that may have to wait until spring to try out (been wanting to figure out the best way to pressurize PVC with a bike pump anyway).  This strip is another good example of telling the whole story and not just giving instructions.  They discuss several failed attempts at pop-bottle rocketry by the characters before their eventual and dramatic success.

I rarely recommend books to people (because everyone is different) but I did wholeheartedly suggest getting the Dangerous Book for Boys earlier this year.  I'll back that up by recommending this book as well for any 7-16 year-old boy or girl who likes to build and experiment with things (with definite adult supervision for the younger kids - but that's half the fun anyway).

First Dangerous Crystal

by Admin 31. August 2007 02:23

Ooooh, our first crystal from the "Dangerous Crystal Experiment" (from Dangerous Book for Boys).

crystal

Ironically nothing grew so far on the "starter rock" hanging from the string.  But there are a whole bunch of little crystals like this one (looks big but it is only about 1cm across).

It is basically pyramid-shaped on the top and comes to a really nice point.  It doesn't have much index of refraction or "color",  though the glow of the computer screen shows nicely in the picture.  It is almost perfectly clear, but under 30x magnification you can see some nice surface details/defects.  It feels really fragile and light and I am pretty sure I could crush it back to powder without much effort.

Why a pyramid?  I need to review some basic Chemistry for this one.  Anyone need a cheap gem?  Just don't get it wet.

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Phun Physics

The Dreyfus Model of Skills Acquisition

by Admin 18. August 2007 07:29

OK, this post will be a little “heady” for a Saturday morning but I want to reference this topic for some other work I am going to do this fall. I am planning to do some non-trivial work to get some resources and links online to help kids get into doing projects and learning about things like physics, space science, and robotics/electronics – things if you know me, you know I’ve been into for a long time. The problem with the way kids learn about these topics nowadays is that it is mostly abstract, in theories, reading, or just “on paper.” To really learn more than trivia and facts about these topics you really need to “do” things with the science, not just learn things “about” them.

There are several articles or models from people that really affect the way I am going to approach things, and have impacted my thinking about the approach to learning things. I’ll hit each of them separately and then pull them all together later as kind of an approach for what I am going to try. None of these articles or their ideas should really come as a surprise to anyone – they make sense when you read them. But the authors do a great job of describing things in a depth and detail that I never could.

The first article and model is the Dreyfus Model – which is based originally on a report by Hubert Dreyfus and Stuart Dreyfus in the early 80s called “A Five-Stage Model of the Mental Activities Involved in Directed Skill Acquisition.” I’ll try to link to the study itself which is in a doc=GetTRDoc.pdf" target="_blank">PDF file (scanned in mirror 783k) – don’t read it yet, just follow along here for a minute.

This study was prepared initially for the Air Force Office of Scientific Research for the training of pilots, but its model and purpose has been used effectively for training everyone from pilots, to nurses, to chess players, foreign language learners, and even computer programmers (Google “Dreyfus Model” http://www.google.com/search?q=dreyfus+model and will see lots of different results of people using it (and some people arguing against it)). I like it, so I am going to use it.

To keep this to as few words as possible, Dreyfus identifies five to seven stages of learning a new skill or domain:

  • Novice,
  • Advanced Beginner,
  • Competent,
  • Proficient,
  • Expert, and
  • Master.

I don’t know about you but I find that many people use terms like “Competent” and “Expert” in describing their skills but really have no objective model for putting them in one category or another. Some people move themselves from not knowing anything about a particular skill up to “Competent” just by reading a book about the topic. Others call themselves an “Expert” after completing one project using a particular skill or technology. I am reminded of an episode of “Monk” where the detective Adrian Monk is going on a boat and someone asks him if he can swim. He says he knows how to swim, and even produces a card from his wallet certifying him as a swimmer (from a correspondence course), but also admits he has never actually been in the water to try out his skills but thinks he’ll do fine. Some people are that way with technology and other domains where they have studied it in books and on the Internet but have never really “done” real-world things to use what they have learned. You learn by doing things, you don’t (can’t) really learn before you do something.

What this model does is two important things: (1) helps better define what these stages of learning mean and (2) explains a workable model for moving people from one stage to the next.

Briefly, the stages:

Novice

A novice is all about following rules – specific rules, without context or modification. You don’t need to “think” you just need to “do”. A rule is absolute, and must never be violated. The main thing to do here is to get experience following directions and doing the new skill. You can follow the instructions on a box of cake mix and hopefully produce a decent cake. All you are responsible for is following directions.

“To improve, the novice needs monitoring, either by self-observation or instructional feedback, so as to bring his behavior more and more completely into conformity with the rule.”

Advanced Beginner

Still rules based, but rules start to have situational conditions. In one situation you use one rule, in other situations you use another. The advanced beginner needs to be able to identify the limited need to selectively apply different rules. So if you want a chocolate cake, follow the chocolate rule(s), if you want a vanilla cake, follow the other rule(s). If you are over 5,000ft of altitude you will need to alter the amount of some ingredients. This is still a recipe, but has a few decision points. Again, follow the different “branches” of instructions and you should be fine. It is easy to see how this could collapse into a large Novice category, but it is a step before the much larger step to Competence.

Competent

You realize that your skill or domain is more complex than a series of rules and branches. You start to see patterns and principles (or aspects) rather than a discrete set of rules – rules become “rules of thumb”. You are lead more by your experience and active decision-making than by strictly following rules. What is developed now are guidelines that help direct competent individuals at a higher level. You now are accountable for your decisions as you are not following the strict rules and context of the previous stages. You’ve made a lot of cakes and have a number of recipes. When asked to make a cake of a different type you pull from experience the best way to put a new cake together. If the new cake doesn’t work out, you are responsible. This is the critical tipping point for most people when learning a new skill – and why most people never really become “competent” in most things they learn. Here you either need to decide to just “follow the rules” or spend the time to get fully involved with and take responsibility.

“Competence comes only after considerable experience actually coping with real situations …”

Proficient

At this point your understanding of your skill or domain has become more of an instinct or intuition. You will do and try things because it just seems like the right thing to do (and you will most often be right). Instead of a discrete set of different parts you can perceive a complete system. A large amount of real-world experience will show you that there are often multiple competing solutions to a specific problem and you have a “gut feeling” about which is correct. “Calculation and rational analysis seem to disappear”. Will quickly know “what” needs to be done and then formulate how to do it.

Proficiency is developed by exposure to a “wide variety of typical whole situations.”

Expert

At this point you are not solving problems or making conscious decisions about things, you just “do” and it works. “Optimal performance becomes second nature.” People may ask you why you decided to do things “that way” and you may not know how to explain to them the 10 steps necessary to get from “A” to “B” because to you it was really just one step. Forcing an expert to detail the steps necessary before proceeding will often cause them to fail or second-guess. Here you think of grandma getting up at 6:00am and making biscuits from scratch for many, many years. She doesn’t measure, time, or probably even think about baking – she just does it, and it works. Very few people will attain this level in a particular skill or domain. Some estimates say 10-15 years in a particular area is required.

An Expert has experience that “is so vast that normally each specific situation immediately dictates an intuitively appropriate action.”

Master

Mastery is mostly about style. A Master of something is really just an “Expert on a roll.” Sometimes you may have witnessed someone or spent time with someone who is so good at something, and gets so caught up in doing it, that you can’t help but feel that you are watching a genius at work. I’d also say a Master is an Expert who can look back and put themselves in a Novice’s shoes and create the rules, and do the monitoring/mentoring necessary to help them move forward. If you have met a Master you remember them – by name – they are rare and you would do well to spend as much time with them as possible. An Expert basketball player could be excellent at execution and without formal thought just picture the ball going through the hoop (and it does). But Michael Jordan could do it with such style, grace and physics-defying ease that you just had to stop everything and watch him when he was “in the groove.”

A Master “is capable of experiencing moments of intense absorption in his work, during which his performance transcends even its usual high level.”

The Point

If you’ve read this far, thanks, and I’ll get to the point (1,000+ words later) – I believe that too many people today are learning just enough to be considered an “Advanced Beginner” in the vast majority of topics. Painfully this is increasingly true in science, math and technology. If you know enough to “pass the test” then that is all you need to know. The No Child Left Behind law was designed to keep people accountable for learning. But instead of having students be able to become Competent or even Proficient in a handful of skills, we have instead created a system where we have students stuck at “Advanced Beginner” in many more subjects – and perhaps unable to move forward. We are teaching kids that it is enough to know “about” things, but not actually “do” things.

So what can we do about it? We need to catalog and create a list of resources that will help kids get from Novice to Competent in science, math, and technology - things that will get them active in doing projects and making the connections necessary to move ahead. A lofty goal, but attainable. Many people are seeing similar voids and doing things about it. Linking and teaming with them will be key in our success.

More on this to come …..

Bruce

p.s. I need a good label for "Level 0" - before Novice - before you've ever really started learning about a particular topic.  "Ignorant" is cold, as is "Empty" - "Unaware" sounds judgmental.  If you haven't heard of Newton's Laws of Motion it most likely isn't your fault, but you aren't quite a "Novice" yet in its study.  Something positive like "ready" or "waiting"  or "willing" - ideas are welcome.

Water Weenies and Crystals

by Admin 14. August 2007 17:26

No, not some weird ritual - but about the most fun you can have with latex tubing and surgical clamps!  I hope you've all had the chance to tie off the end of a nice length of 1/4" latex tubing and fill it with pressurized water (if you don't have clamps you can just "pinch" off the end).  Way better pressure and longer lasting than the best Super Soaker (and much cheaper too - though not as portable).  I've heard a "Bic" pen on the end gives a better filling interface and directional nozzle but the kids seemed to do just fine without any extra stuff.  I seem to remember the tubing is just the right diameter to fit under dorm room doors as well - but that's another story.  Too bad I only ordered 25' of the stuff - just enough left over for a nice water balloon launcher ....

Oh, and I got a decent supply of Aluminum Sulfate if anyone is doing the "Dangerous Book For Boys" make-your-own-crystals experiment(s).  I probably have enough extra for one or two batches. It's nothing special really - could do similar things with sugar or salt even, but it supposedly works well, and is less toxic than other substances (really just "alum" powder).  First come first served if you want to do a quick experiment with the kids.  But I'm keeping my new Pyrex beakers and chemical safety glasses for myself.

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Phun Physics

Wii Physics - Measure your 0-60 time with a Wiimote

by Admin 30. July 2007 08:53

I have to admit the geek in me thought immediately of how the Wii remote could be used as a cheap 3-axis bluetooth-enabled accelerometer.   Until now such a thing would cost more than the cost of an entire Wii system (and double for the software to process the data).  Now this can be done on the cheap.

I personally think that an accelerometer should be in all driver's-ed cars to help teach new drivers about their acceleration curves, and how to start, stop, and turn without exceeding a certain number of "Gs" or have too much "jerk" in their motions.

Anyway, here is a really good start ... - Bruce

Hackszine.com: Measure your 0-60 time with a Wiimote

Measure your 0-60 time with a Wiimote

wiimote_jetta_20070729.jpg

Here's how you can use the Wiimote's built-in accelerometers to measure your ride's G forces and 0-60 time:

I got this idea after seeing some physics class use the wiimote in some kinda pendulum experiment.

Why not use the wiimote's built in 3-axis accelerometers to measue g-forces, acceleration and even calculate my own 0-60mph times!

So I did. I wrote a script to dump all the g-force readings from the wiimote to a comma separated value file, then did some post processing in MS Excel, and voila, I can see every bump, every curve, my acceleration and braking, and even calculated my current speed using high school physics (v=a*t)

 

I wonder how much weight you could strip off this thing to get it to its bare essentials. A LiPo battery a gumstix board and maybe this could be extended to model rocketry or autonomous helicopter applications.

Wii Remote Accelerometer Measurements - [ via] Link

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Phun Physics

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