Stephen, I take it that your model's "intuition" is that the bottom should start moving a bit before the top gets to it.
I looked at Eric's video again and again, feeling that I had seen something like it before. And then I remembered what that something was. The collapse of the twin towers. N -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Stephen Guerin Sent: Sunday, October 02, 2011 1:04 PM To: The Friday Morning Applied Complexity Coffee Group Subject: Re: [FRIAM] Droping a Slinky (Q&A) Cool! Thanks, Eric. I was curious and mocked up a quick spring model in Netlogo to play with the dynamics. You can see a video here http://www.youtube.com/watch?v=AtWiM5jicOI -S On Sat, Oct 1, 2011 at 7:07 PM, ERIC P. CHARLES <[email protected]> wrote: > Below are links to some science videos nifty for two reasons. > > 1) They ask and answers a pretty cool question: What happens when you > hold a slinky out at shoulder height, so it is extended down (the > bottom still off the ground) and you let go. Think about it for a > second. How does the top part of the slinky move, how does the bottom > part move, how does the center of mass move? A good physics thought > experiment! (If you are having trouble imagining it, here is the question: > http://www.youtube.com/watch?v=wGIZKETKKdw) > > 2) The answer illustrates the weirdness of trying to apply the term > 'information' to all possible situations. At about 1:30, the physics > prof offers an explanation for what happens, and (for just a second) > talks as if one part of the slinky is transmitting 'information' about > its movement to another part of the slinky, which is bizarre way. The > slinky itself is moving, it is not transmitting information about the movement, it IS moving. > Why would you say that it takes time for 'the information to > propagate', instead of simply saying that 'it takes time for the > slinky to move'. Weird, weird, weird. > > At any rate, Here is the cool answer: > http://www.youtube.com/watch?v=eCMmmEEyOO0 > (and it continues here: http://www.youtube.com/wa! > tch?v=oKb2tCtpvNU&NR=1) > > This seemed like the type of thing lots of people on the list would > get a kick out of... so... hope you do. > > Eric > > ============================================================ > FRIAM Applied Complexity Group listserv Meets Fridays 9a-11:30 at cafe > at St. John's College lectures, archives, unsubscribe, maps at > http://www.friam.org > -- --- -. . ..-. .. ... .... - .-- --- ..-. .. ... .... [email protected] 624 Agua Fria, Santa Fe, NM 87501 office: 505.995.0206 mobile: 505.577.5828 redfish.com | sfcomplex.org | simtable.com | ambientpixel.com ============================================================ FRIAM Applied Complexity Group listserv Meets Fridays 9a-11:30 at cafe at St. John's College lectures, archives, unsubscribe, maps at http://www.friam.org ============================================================ FRIAM Applied Complexity Group listserv Meets Fridays 9a-11:30 at cafe at St. John's College lectures, archives, unsubscribe, maps at http://www.friam.org
