Date: Thu, 9 Feb 2012 19:46:51 +

Author: Curry, Robert T

Subject: Re: Bicycle Wheel - Two on Same Axle

Post:

For many years I have had a piece of a WWII Norden bombsight I have used for that demonstration. It comprises 3 coaxial geared wheels. If you hold one end and spin the other, everything turns the same way. Reverse it, and you get two identical wheels turning opposite directions at the same speeds. The way I use it is to spin it and toss it up in the air. One way it is stable, the other way it tumbles. You do hear the bearings scream when it tumbles, however, so even though there is no net angular momentum, each individual wheel is resisting rotation.
BC

-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of Adolf Cortel
Sent: Thursday, February 09, 2012 1:11 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Bicycle Wheel - Two on Same Axle

When I try to move the frame, I feel the way it behaves is about the same when the weels are not rotating or they turn in opposite direction.
Adolf

El 09/02/2012 19:26, Bill Norwood escribió:
> But it doesn't respond the same way as when the wheels are not rotating, right?
>
> -----Original Message-----
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu]
> On Behalf Of Adolf Cortel
> Sent: Thursday, February 09, 2012 12:24 PM
> To: tap-l@lists.ncsu.edu
> Subject: Re: [tap-l] Bicycle Wheel - Two on Same Axle
>
> Hi Bill
> This is a demonstration of the vectorial character of angular momentum:.
> It only behaves as a gyroscope if the weels turn in the the same direction.
> Not with bycicle weels, but the same idea:
> http://www.youtube.com/watch?v=bzbVwiIeM0M
>
> Adolf
>
> El 09/02/2012 16:57, Bill Norwood escribió:
>
>> OK, I've finally decided to ask the following question:
>>
>> Suppose one puts two identical bicycle wheels on the same axle, and sets them at identical rotational velocities, but in opposite directions.
>>
>> What happens when one tilts or tries to tilt the axle if the axle is a non-bending one?
>>
>> Bill Norwood, U of MD at College Park
>>
>>
>> -----Original Message-----
>> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu]
>> On Behalf Of Sam Sampere
>> Sent: Thursday, February 09, 2012 10:43 AM
>> To: 'tap-l@lists.ncsu.edu'
>> Subject: Re: [tap-l] Bicycle Wheel
>>
>> I make my own. Have a local bike shop BUILD you a 27" or 700c wheel using a BMX hub. You can't bend that axle! Fill the tire with whatever you want. I just use the tire and tube as is and use my old weighted wheel for the rotating stool demos. It's quite simple to weight this, though.
>>
>> Sam
>>
>> --------------------------
>> Sam Sampere
>> Syracuse University
>> Department of Physics
>> 201 Physics Building
>> Syracuse, NY 13244
>> 315-443-5999
>> 315-443-9103 (fax)
>>
>> -----Original Message-----
>> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu]
>> On Behalf Of Dale E. Stille
>> Sent: Monday, February 06, 2012 1:52 PM
>> To: tap-l@lists.ncsu.edu
>> Subject: [tap-l] Bicycle Wheel
>>
>> Tappers,
>>
>> In your opinion, who has the best bicycle wheels with weighted rims for gyroscope/angular momentum demos.
>>
>> Thanks,
>> Dale
>>
>>
>>
>>
>>
>>
>
>
>

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