Date: Fri, 06 May 2011 14:10:34

Author: --- Jerry DiMarco

Subject: Re: Invisible force - stick-slip motion demo

Post:

Yes, I understand now. That's a very clever problem...

Jerry
D


At 5/6/2011 10:16 PM, you wrote:
>Jerry, sorry for the low quality of the video.
>
>Anyway, the line is completely horizontal!!! No tricks, just physics....
>
>Simcha
>
>
>-----Original Message-----
> Because the video is unsteady, it is difficult to make
> observations. Are you raising or lowering the line when you stroke it,
> or does it remain at the same level?
>
> Jerry D
>
>At 5/6/2011 07:38 PM, you wrote:
> >Hi all,
> >
> >A phenomenon discussed in the theoretical exam on the Asian physics
> >Olympiad 2011
> >
> >http://www.youtube.com/watch?v=3_WLrWh0-W0
> >
> >The slip-stick motion mode (high-frequency sine/linear motion
> >interchanging fast due to the difference between static and kinetic
> >friction combined with elasticity) create a sawtooth-like movement, used
> >to move distant objects.
> >
> >Have a nice and pleasant weekend, Simcha
> >
> >Simcha Segev - Technical Manager
> >Physics Demonstration Lab
> >School of Physics and Astronomy
> >Tel Aviv University, Ramat aviv, Israel
> >Tel. 972-3-6408077 Fax. 972-3-6429306
> >E-mail: simcha@post.tau.ac.il
> >Web site : http://www.tau.ac.il/~simcha




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