Gravity related youtube videos.

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Furcurequs
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Gravity related youtube videos.

Post by Furcurequs »

Here are some gravity related youtube videos that I've found interesting.

The first shows an evacuated "drop tower" in Germany. Payloads are launched upwards from the bottom so that experiments can be performed within the payload capsule while "weightless."

The capsule is shot upward at 30g, experiences 0g for about 10 seconds while moving upward and falling back down and then the capsule is decelerated back at the bottom at around 35g to bring it to a stop.

The fellow in the video got his numbers wrong about the distance the capsule falls each second, however.

If it starts at 0 velocity, the distance traveled is simply 1/2 x acceleration x time^2.

Rounding g to 10 m/s^s, that gives us 5 meters it falls in the first second, 15 meters in the second second (20 m total in 2 seconds), 25 meters in the third second (45 m total in 3 seconds), and 35 meters in the fourth second (80 m total in 4 seconds), etc.

https://www.youtube.com/watch?v=4aCMDQsx740

The next two videos are by Bruce Yeany, a middle school science teacher. I've posted some of his videos here before. In the first one of these he talks about his rolling tracks for some of his gravity experiments and in the second video he shows how he constructs some of the tracks.

https://www.youtube.com/watch?v=JWtsOiVxIIE

https://www.youtube.com/watch?v=iHvBoij7-7k

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re: Gravity related youtube videos.

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This video isn't specifically gravity related, but I do think some here would find it interesting. It shows a humanoid robot made by the company Boston Dynamics doing acrobatics. The robot even does a back flip. So, not quite the same as the robots I worked with at IBM in the 1980s, which were basically just multi-axis stationary arms.

"What's new, Atlas?"

https://www.youtube.com/watch?v=fRj34o4hN4I

Now, the following video is specifically about gravity. It's approximately 26 minutes long and from the youtube channel Vsauce. In it gravity is explained from the Newtonian perspective through to the Einsteinian - with its notion of mass warped spacetime.

"Which Way Is Down?"

https://www.youtube.com/watch?v=Xc4xYacTu-E
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re: Gravity related youtube videos.

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I don't think the following PBS NOVA program has made it to youtube (yet), but some of you may be able to watch it from the PBS web site. The episode is about black holes and is nearly 2 hours long.

"Black Hole Apocalypse"

http://www.pbs.org/video/black-hole-apocalypse-yj34qi/
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Post by Gregory »

Haha, Vsauce is one of my favourites! It's one of the best channels I think.
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re: Gravity related youtube videos.

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Hey Gregory,

To be honest, for some reason I typically find Vsauce videos a bit hard to watch. I really don't know for sure why that is, either, because I certainly enjoy science stuff.

Maybe it's because the videos tend to be too long for my short attention span, or perhaps they meander too much for my tastes, or I don't know, maybe it's something else about the presentation and/or music or even the presenter that puts me off to them.

Anyway, whatever it is, I seem to have some sort of mental block when it comes to watching them. I've actually been planning on going back to look at old videos to see if I've missed anything good, but that always seems like a chore to me rather than something to get excited about.

I do try to like them. I'm supposed to like them. ...but I just don't go looking for them like I do with the videos from other youtube channels.

I don't mean to be this way. Just different strokes for different folks, I guess. ...lol
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Post by Gregory »

Yes, his clips are usually longer. I also got this feeling a few times, but otherwise it was quite enjoyable. Well, I haven't watched all of his videos, only what I was intrested in.

For example, this one about rotational stuff is really a good upload:
https://youtu.be/XHGKIzCcVa0
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re: Gravity related youtube videos.

Post by Furcurequs »

Sorry I didn't respond sooner.

Yes, that one was good. I guess I better concentrate on the subjects that interest me most, then, and maybe I'll get used to his channel.

This is a little off-topic, but I think some here might find it interesting. The latest episode of the PBS series Secrets of the Dead was about the recent scanning of the Egyptian pyramids which detected a couple of "voids" in the great pyramid.

Several teams set up muon detection plates and left them for months to do something akin to x-raying the pyramids. The muons are produced primarily in the upper atmosphere through cosmic ray bombardment.

http://hyperphysics.phy-astr.gsu.edu/hb ... onatm.html

Here's the PBS website for the show:

"Scanning the Pyramids"

http://www.pbs.org/wnet/secrets/scannin ... mids/3615/

The largest void is supposedly above the grand gallery and may be about equal to it in size. The smaller void is nearer the outer surface of the pyramid and is above one of the current entrances to the pyramids.
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re: Gravity related youtube videos.

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I like this guy's videos. He has an engineering background and discusses the design criteria of lots of interesting things. His latest video is about optimizing mousetrap powered cars for competition. His name is Mark Rober, btw.

"1st place Mousetrap Car Ideas- using SCIENCE - YouTube"

https://www.youtube.com/watch?v=b7zWwo9dbiU

He has one video where he designed a device which moves a dart board so that when you throw a dart you'll always hit a bullseye.
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re: Gravity related youtube videos.

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This fellow does some pretty nice videos explaining modern physics principles. His name is Dr. Don Lincoln, and he is a physicist at Fermilab. Many of his videos are on the Fermilab youtube channel, but there is a lot of other stuff there, too, which needs to be sorted through to find his.

So, it may be easier checking out one or more of the youtube playlists featuring his videos specifically - where others have done the sorting for us:

https://www.youtube.com/results?search_ ... n+playlist

Anyway, I'm currently downloading videos from some of the playlists using youtube-dl to watch later.
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re: Gravity related youtube videos.

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Here's a play list for videos by a guy named Dr. Bob Eagle. He goes by DrPhysicsA on youtube. He works through some of the basic physics math.

https://www.youtube.com/playlist?list=P ... 4x959UXM4y
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re: Gravity related youtube videos.

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I found this youtube channel called "Physics Demos" that looks to be pretty good. Here's part of the description:
This channel contains physics lectures and demonstrations by Dr. Boyd F. Edwards, Professor of Physics at Utah State University...
There are over 300 videos and the basic physics and math seems to be covered pretty well. I'm rather surprised it's not a more popular channel. The average number of views per video seems to be only around one or two hundred.

https://www.youtube.com/channel/UCV5U9y ... tNL710UP0w

Here's also a playlist of 85 videos of basic physics demonstrations done by another physics professor, a Clinton Sprott from the University of Wisconsin, but these seem to be done mostly for children without going too in depth with the physics involved or covering any math. I still like watching this sort of stuff, though.

https://www.youtube.com/playlist?list=P ... ApfJ20YwAN
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re: Gravity related youtube videos.

Post by Furcurequs »

Here's a nice demonstration of the conservation of angular momentum using a Hoberman Sphere. It's from the youtube channel I posted above.

https://www.youtube.com/watch?v=64t-dVtDwkQ
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Post by MrVibrating »

Beautiful demo of CoM, that!

And scissorjack pr0n to boot!

I've thought about trying curved jacks, but there's not a lot they can do, for all their complication, that a force applied between couple of radial armatures couldn't do much more easily.


The really useful properties of CoM-induced inertial torques, from our point of view, is that they produce no instantaneous counter-torques - which are instead delayed in time until whenever the MoI resets - and also the fact that they're driven by the very constancy of their net momentum - all other means of applying mechanical acceleration necessarily involve inputting additional momentum to the system!

It's this latter effect that i'm exploiting to gain momentum from gravity - subsidise a weight lift with inertial torque and you input less momentum to gravity than it outputs when dropping the mass over the same height. Hence CoM directly causes a gain in system momentum, from gravity.

I still haven't decided if this particular interaction is changing Earth's momentum or not, but i'm guessing either the buck stops there, or else this is some kind of quantum-classical 'free momentum from the vacuum' type situation. Bloody fascinating either way..
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re: Gravity related youtube videos.

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Here's a near two hour discussion on some of the latest in black hole research hosted by Brian Greene:

"Darkness Visible: Shedding New Light on Black Holes"

https://www.youtube.com/watch?v=3JE_KMfuEWk

It's from the "World Science Festival" youtube channel:

https://www.youtube.com/channel/UCShHFw ... g7hr4f1R8A

Here's an interesting presentation on "Lagrange Points." For example, it's possible to put a satellite into an orbit around the sun that is larger than the earth's orbit or smaller than the earth's orbit while still keeping the same period per orbit as that of the earth. The satellite will be in line with the earth and the sun, but at the outer (L2) Lagrange Point the Moon's gravity adds to that of the Sun and at the inner (L1) Lagrange Point the moon's gravity subtracts from that of the sun's.

"Lagrange Points - Sixty Symbols "

https://www.youtube.com/watch?v=mxpVbU5FH0s

It's from the "Sixty Symbols" youtube channel:

https://www.youtube.com/channel/UCvBqzz ... Y7Axb-jZew

Here's another recent interesting video from their channel:

"Falsifiability and Messy Science - Sixty Symbols"

https://www.youtube.com/watch?v=xG3-_tgDE0k
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re: Gravity related youtube videos.

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Here's a video discussing how NASA's Parker Solar Probe will have to use the gravity assist maneuver with Venus to remove enough of its tangential speed to get it near the sun.

"NASA | Parker Solar Probe: It's Surprisingly Hard to Go to the Sun"

https://www.youtube.com/watch?v=MvKvX-niMLA
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