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The Surprising Physics of Pulling a Bike With a Rubber Band

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  The Surprising Physics of Pulling a Bike With a Rubber Band Sam Wormley <swormley1@gmail.com> - 2015-09-19 08:56 -0500
    Re: The Surprising Physics of Pulling a Bike With a Rubber Band benj <none@gmail.com> - 2015-09-19 13:47 -0400
    Re: The Surprising Physics of Pulling a Bike With a Rubber Band jimp@specsol.spam.sux.com - 2015-09-19 17:58 +0000

#521999 — The Surprising Physics of Pulling a Bike With a Rubber Band

The Surprising Physics of Pulling a Bike With a Rubber Band
> http://www.wired.com/2015/09/surprising-physics-pulling-bike-rubber-band/

> Do you need some practice with force diagrams for your introductory
> (or advanced) physics course? Here are three questions (and the last
> one is awesome) about the motion of a bike as it is pulled.

> Update
>
> Chad Orzel brings up a very interesting point about this whole
> “pulling on the bottom” case.
>
> Key to @rjallain‘s bike trick is that you’re not exerting torque
> around the hub of the wheel, but about the contact point with
> ground.
>
> — Chad Orzel (@orzelc) September 18, 2015
>
> If you think of the bike wheel rotating about a point where it
> touches the ground instead of rotating about the center of the wheel,
> you might get this question correct. Chad also claims that if you
> pulled the bike at the exact bottom (where it touches the ground),
> the bike would just slide and not roll. I agree.


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#522045

On 09/19/2015 09:56 AM, Sam Wormley wrote:
> The Surprising Physics of Pulling a Bike With a Rubber Band
>> http://www.wired.com/2015/09/surprising-physics-pulling-bike-rubber-band/
>
>> Do you need some practice with force diagrams for your introductory
>> (or advanced) physics course? Here are three questions (and the last
>> one is awesome) about the motion of a bike as it is pulled.
>
>> Update
>>
>> Chad Orzel brings up a very interesting point about this whole
>> “pulling on the bottom” case.
>>
>> Key to @rjallain‘s bike trick is that you’re not exerting torque
>> around the hub of the wheel, but about the contact point with
>> ground.
>>
>> — Chad Orzel (@orzelc) September 18, 2015
>>
>> If you think of the bike wheel rotating about a point where it
>> touches the ground instead of rotating about the center of the wheel,
>> you might get this question correct. Chad also claims that if you
>> pulled the bike at the exact bottom (where it touches the ground),
>> the bike would just slide and not roll. I agree.

Sam, any asshat can cut and paste and pretend they are smart. But this 
is a DISCUSSION group as the charter you constantly post (but ignore) 
states.

So tell us what YOU think. Let's attach the band to a lower spoke as 
before but now put the bicycle on ICE so the friction force is LESS than 
pulling force. In this case the front wheel will turn backwards! But 
which way does the bike go?  Does the rear wheel also slide? Discuss 
this with us, "professor".



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#522052

Sam Wormley <swormley1@gmail.com> wrote:
> The Surprising Physics of Pulling a Bike With a Rubber Band

How about a study on pushing a rope, shit head?



-- 
Jim Pennino

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