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Author Topic: Three experiments with gyroscopes  (Read 137 times)

Iacopo

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Three experiments with gyroscopes
« on: September 08, 2019, 10:07:23 AM »


In this video, I used gyroscopes for some experiments, with the aim to clarify/confirm some ideas I have about spinning tops.
Sometimes gyroscopes are more suitable than spinning tops themselves, for to understand spinning tops.
Everything is explained in the video.


 https://www.youtube.com/watch?v=s-wt6m7KDFo
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Iacopo

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Re: Three experiments with gyroscopes
« Reply #1 on: September 10, 2019, 08:50:01 AM »

There is a test I made which I didn't include in the video, I explain it here:

I was curious to see whether the weight added on the side of the gimbal of the gyroscope contributed or facilitated in any way to make that side to go down:  in the video it is shown that it is only the friction of the bearings in the base of the gyroscope that makes the weighed down side of the gimbal to go down.

When the torque coming from the friction of those bearings is eliminated, the gimbal stays level and doesn't tilt anymore, while the gyroscope precesses, in spite of the added weight on one side of it.

I wondered whether, from this neutral behaviour, applying torques to accelerate or decelerate the precession, the weight on the side of the gimbal helps in any way that side to go down.

I added 1.2 grams weight to the thread, (see video), so to have a net torque along the vertical axis of the gyroscope 0.000051 Newton meters, in the direction to accelerate the precession.  This made the gimbal to tilt up by 20-22 degrees after 7 precession revolutions.
By saying "the gimbal to tilt up" I mean the side of the gimbal with the added weight to rise.

Then I removed 2.4 grams from the thread, so to have a net torque along the vertical axis of the gyroscope of the same magnitude but with opposite direction, (braking the precession). 
This made the gimbal to tilt down by 20-22 degrees after 7 precession revolutions

The weight on the gimbal, (12.2 grams), didn't influence in any way the tilting speed of that gimbal.
It didn't help the gimbal to tilt down faster, and it didn't brake the gimbal from rising, absolutely.

I made this test because I wasn't totally sure about the result.



   
« Last Edit: September 10, 2019, 08:52:50 AM by Iacopo »
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ta0

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Re: Three experiments with gyroscopes
« Reply #2 on: September 11, 2019, 06:19:55 AM »

Wow, Iacopo, you don't stop to impress me!  :o
The physical simulation of a frictionless precession is genius.
Your whole setup and the video documenting it are perfect. 8)

I have to confess that I'm still not convinced that rolling resistance is the correct explanation but it's not something I can discuss writing on my phone. When I'm back home and have some time, I'll write my thoughts.

Thanks for documenting and sharing your superb experiments!
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Iacopo

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Re: Three experiments with gyroscopes
« Reply #3 on: September 11, 2019, 12:12:23 PM »

Thank you for your kind words, Ta0.

When I'm back home and have some time, I'll write my thoughts.

I will read them with interest.
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Jeremy McCreary

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Re: Three experiments with gyroscopes
« Reply #4 on: September 11, 2019, 01:13:02 PM »

Great experimental work, as always! Still processing your methods and findings. Like ta0, travelling now and can't do it justice on my phone.
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Playing with the physical world through LEGO

Iacopo

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Re: Three experiments with gyroscopes
« Reply #5 on: September 11, 2019, 02:35:54 PM »

Thank you, Jeremy.  I would like to know your opinion too.
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