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Will a Newtons Cradle work with rings instead of balls?


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#1 SpleenBeGone

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Posted 22 October 2014 - 09:18 AM

Anyone seen one? I think it could be done. 


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#2 Calvary

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Posted 22 October 2014 - 10:23 AM

I would have thought so. Surely the physics is the same?


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#3 SpleenBeGone

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Posted 22 October 2014 - 11:02 AM

I'm thinking so, but there will be a lot less mass, and they'll have to be hooked up through a strait pole with a bearing, so I'm not sure if they'll bounce as well. 


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#4 Calvary

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Posted 22 October 2014 - 12:12 PM

hmmm, ask sanic.


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#5 SpleenBeGone

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Posted 22 October 2014 - 01:23 PM

Who?

 

Also, the reason I'm asking, I've ended up with some very precisely milled aluminum rings that bounce off of each other with a satisfying noise. Wrench for scale.

 

 

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#6 Mister Sympa

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Posted 22 October 2014 - 05:26 PM

Gol may have been making a Sanic the Hedgehorgg reference, what with rings and such...


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#7 No-Danico

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Posted 22 October 2014 - 06:13 PM

Gol may have been making a Sanic the Hedgehorgg reference, what with rings and such...

 

I hope so.

 

Also, I think density might be the only issue. Since they're not balanced the same way a sphere would be, a slight wobble mess things up. Aside from that, I don't see any reason it wouldn't work the same. Weld little hoops on top and run a wire through them and do it up. Then paint them gold and start turning woodland critters into robots.


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#8 Mister Sympa

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Posted 22 October 2014 - 06:22 PM

Gotta physics fast!!


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#9 SpleenBeGone

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Posted 22 October 2014 - 06:36 PM

I'm actually going to use solid supports that thread into the rings so that wobbling won't be an issue.

Will be stopping by my friends machine shop friday to see what I can do. 


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#10 DaRatmastah

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Posted 22 October 2014 - 08:57 PM

Solid supports are going to screw with the conservation of motion a bit, so the bounce duration will probably be shorter than a "normal" newton's cradle.  I'd advise using some extremely well-lubricated bearings to mount the support to eliminate as much friction as possible (I assume they'll be hinged in some way).



#11 SpleenBeGone

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Posted 23 October 2014 - 05:45 AM

I'm going to use a few bearings I pulled from hard drives, I'm assuming they would be of high enough quality to make this work, if it's going to happen. 


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#12 SushiKitten

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Posted 23 October 2014 - 12:04 PM

I was talking about this with my friends at school, I think you might lose a lot of the energy because of the vibrations in the rings. It might work, but not for as long as one with solid balls.



#13 SpleenBeGone

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Posted 23 October 2014 - 12:18 PM

That's something I didn't consider. I wonder if I made it out of something super hard like Tungsten if it'd work. Still going to try the aluminum this weekend though.

 

Physics is a fickle mistress. 


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#14 SpleenBeGone

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Posted 25 October 2014 - 07:22 AM

So apparently the parts are too small for the guy I knew to work with. I'll have to come up with a new plan. 


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#15 Mister Sympa

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Posted 25 October 2014 - 04:30 PM

Keep us posted and I want video when this baby's up and clacking.


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#16 SpleenBeGone

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Posted 25 October 2014 - 06:36 PM

Yeah, I've got another plan I came up with today. If I finish up some stuff on my jeep tomorrow I might try it. 


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#17 Mister Sympa

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Posted 25 October 2014 - 06:40 PM

Woo!! I'm honestly excited!


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#18 SpleenBeGone

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Posted 30 October 2014 - 12:47 PM

Ok, so quick test using a few parts I had laying around. Vibrations are going to be a big thing, and I may need some harder metal to work with. I believe I have a solution for both.

 


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#19 SushiKitten

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Posted 31 October 2014 - 11:00 AM

It kind of works! That's pretty cool.



#20 SpleenBeGone

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Posted 31 October 2014 - 05:07 PM

Yeah, that's with super thin bits of plastic from security badges. I think I just need to work on minimizing the lost energy. 


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