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Article #1742Re: Science Olympiad anyone?
From: Kit Doan
Date: Thu, 10 Mar 1994 02:58
Date: Thu, 10 Mar 1994 02:58
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1633 bytes
>On Mon, 7 Mar 1994, Mark Joe wrote: > >> Yes, I did consider using a cord for the brakes, but I soon found out that >> using the string would cause the vehicle to roll back because the string will >> retract rather then keep straight after reaching the finish line. >> > The most elegantly simple mechanism I saw had a cord unwind as the object rolled, the cord lowered a large mass which simply blocked forward motion after it reached the floor. The other method I liked for originality used "quantized wheel roll" achieved by weighting at one location on the rim all four wheels of the projectile. It then rolled until the mass was down and with careful calibration rolled to less than a few cm from the finish line. Kit Doan, Assistant Head York House School 4176 Alexandra Street Vancouver BC V6J 2V6 Canada kdoan@cln.etc.bc.ca (604) 736-6551 Fax: (604) 736-6530
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 16cfd8,36b33a6d0837e243 X-Google-Attributes: gid16cfd8,public X-Google-ArrivalTime: 1994-03-09 18:58:19 PST Path: arc1-ca.pugleaf.net!gmd.de!newsserver.jvnc.net!news.cac.psu.edu!psuvm!auvm!CLN.ETC.BC.CA!kdoan Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU Newsgroups: bit.listserv.physhare Return-Path: <@AUVM.AMERICAN.EDU,@PSUVM.PSU.EDU:owner-physhare@PSUVM.PSU.EDU> Return-Path: <@PSUVM.PSU.EDU:kdoan@CLN.ETC.BC.CA> Message-ID: <9403100302.AA17897@cln.etc.bc.ca> Date: Wed, 9 Mar 1994 18:58:19 -0800 Sender: Sharing resources for high school physics <PHYSHARE@PSUVM.BITNET> From: Kit Doan <kdoan@CLN.ETC.BC.CA> Subject: Re: Science Olympiad anyone? Lines: 23