Date: Fri, 6 May 2011 22:16:41 +

Author: --- "Simcha Segev"

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


Jerry, sorry for the low quality of the video.

Anyway, the line is completely horizontal!!! No tricks, just physics....


-----Original Message-----
From: [] On
Behalf Of Jerry DiMarco
Sent: Friday, May 06, 2011 9:47 PM
Subject: Re: [tap-l] Invisible force - stick-slip motion demo

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
>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
>Web site :