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Never tried that one, but it sounds cool.
C
Sent from Charlie Carlson's iPad
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On Jul 23, 2013, at 1:39 PM, Jonah Cohen <[log in to unmask]> wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
>
> Funny you should mention that, Charlie. Here's something reverse
> engineered from a more complicated, potentially messier (and, let's be
> frank, far cooler) demo I saw from the wonderful crazy people at the
> Franklin Institute:
>
> All you need is a length of PVC pipe or broom handle (diameter not
> important), rope, a key ring with a lot of keys, and some kind of
> weight. (A baseball or softball will do; you just need to attach one end
> of the rope to it - perhaps with an eye-hook.) PVC may be too slick for
> the demo - if so just scuff it up with sandpaper.
>
> Attach the weight to one end of the rope, the key ring to the other. Put
> the pipe/broom handle in or on something so that it's parallel to the
> ground. Two people could even hold the pipe if they're steady-handed.
> Hold the side of the rope with the keys on one side of the pipe, with
> the weight on the other side of the pipe. Take a couple steps back so
> that you're pulling the weight up, pulley-style, until it is almost at
> the pipe. You should be holding the keys with the rope taut.
>
> Now, give the keys a very little push forwards, so that the rope on
> their side of the pipe swings forward, like a pendulum.
>
> When you let go of the keys, the weight on the other side of the pipe
> drops, making the rope shorter and shorter on the keys' side of the
> pipe, and - conservation of angular momentum - that makes them swing
> faster and faster. In fact, they should go so fast that their end swings
> around the pipe and gets tangled in the rope, stopping the weight before
> it hits the ground. It takes a little trial and error with the height of
> the pipe, length of the rope etc, but this isn't too hard to master.
>
> You can tie it in to spinning, with things like CoAM showing why
> divers/skaters/gymnasts go into a tighter tuck to rotate faster etc
>
> Good luck, Alli, and I'm dearly hoping you're including the scene from
> Strangers on a Train,
> Jonah Cohen
> Outreach & Public Programs Manager
> The Children's Museum
>
> -----Original Message-----
> From: Informal Science Education Network
> [mailto:[log in to unmask]] On Behalf Of Charlie Carlson
> Sent: Tuesday, July 23, 2013 4:21 PM
> To: [log in to unmask]
> Subject: Re: spin experiments
>
> ISEN-ASTC-L is a service of the Association of Science-Technology
> Centers Incorporated, a worldwide network of science museums and related
> institutions.
> ************************************************************************
> *****
>
> What about something related to the conservation of angular momentum?
> C
>
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