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Subject:
Re: science of ziplines
From:
Erich Rose <[log in to unmask]>
Reply To:
Informal Science Education Network <[log in to unmask]>
Date:
Tue, 10 May 2011 18:20:10 -0500
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ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************

Certainly in the case of a zip-line the pulley is acting as a wheel. 

Pulleys can also behave like gears multiplying or dividing the revolutions of various shafts. 

I love simple machines.  I was trying, the other day, to explain to someone that a screw is just an inclined plane wrapped around itself.

Erich Rose

Erich Rose Design
807 The Living End
Austin, TX 78746
512-626-9930; [log in to unmask]




On May 10, 2011, at 4:53 PM, Javier Rivera wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
> 
> Hello
> A pulley is used to change the direction of a force and under certain arrangements, distribute the tension forces caused by a weight. In the case of a zipline, the pulley is not used to change direction of forces; it is used to roll along the cable.
> The way I see it, the pulley could be replaced by a rolling ball along the cable (for purely diagrammatic purposes).
> 
> Javier Rivera
> Astronomy Programs Manager
> Santa Barbara Museum of Natural History
> 2559 Puesta Del Sol
> Santa Barbara, CA 93105
> (805) 682-4711  ext. 173;   [log in to unmask]
> http://sbnature.org/gladwin/3.html
> 
> -----Original Message-----
> From: Informal Science Education Network [mailto:[log in to unmask]] On Behalf Of Fournier, Kathy
> Sent: Tuesday, May 10, 2011 2:43 PM
> To: [log in to unmask]
> Subject: science of ziplines
> 
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
> 
> Hey all:
> 
> I need some help in settling a difference of opinion among my staff. We
> are writing up the science of a zipline for a new exhibit and there is
> some disagreement on whether or not the 2 simple machines involved are
> an inclined plane (they slope of the wire) and a pulley OR an inclined
> plane and a wheel and axle.
> 
> 
> 
> I know this group will have plenty of insight so bring it on!
> 
> 
> 
> Kathy Fournier
> 
> Associate Vice President of Education
> 
> McWane Science Center
> 
> 200 19th Street North
> 
> Birmingham, AL 35203
> 
> 205-714-8254
> 
> [log in to unmask]
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> ***********************************************************************
> For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.
> 
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> 
> Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.
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Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.

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