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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]
>
>
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>
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>
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>
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For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.
Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.
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