John Heisz Thanks, John. The plan for it is only $2.99 if you want to download a copy! Just kidding. I put a link at the end of the video for you. Glad you watched ;)
I think I realize why I like you better than other TH-camrs. Your work makes me think, but it's also interesting. It's rare that intellectual and interesting mix in my experience, but I've been hooked on your videos.
I love your videos Pocket, I've never really been very big into wood working, but you have a voice and a personality that makes it impossible to stop watching. Keep up the amazing work.
baconsoda I'm glad you liked it. How is it that my bizarre content and nasty commenting habits haven't driven you away yet? You must be a glutton for punishment! I really do appreciate the support- thanks.
Wow, you're a young version of "Ask Mr. Wizard." I learned more watching his Saturday half-hour TV show than I did in a month of ossifyingly-boring science classes in school. BRAVO!!!
FRICKIN' SCIENCE, BRO. Thanks for the video(s), really did seem interesting. As unintellectual as I am regarding physics, your videos are always fascinating and informative. Just another subscriber to support you til' the end. Even by then, haha
Really good description and instruction. (Did drilling that third hole SLIGHTLY shift the center of gravity by removing some material on one side of the center lines?)
Awwww... i thought your second channel would be harder to find. I thought the clue was the Pixel image in the background of some of your shots (the dark green one holding a ball). I even took a screen dump and used google image search to try and find it because i didn't recognise what it was... ...and it turns out that the link was in your signature. BTW, your channel is awesome :-)
Great Video. Now I understand how I might have tackled one of the problems on my college physics exam some 42 years ago. " where is center of mass if the earth were made of half lead and half wood" . Duh get the string.
Ah, I should have looked closer, I did a lot of Perler bead fractals as a kid, nothing that cool. I wonder if resin encased Perler bead pixel art has been done much.
GeneralSeptem Nice catch. But since you know what it is, it would be fair for me to assume that you know where it came from. It works perfect; it's heavy, symmetrical, and it has a hole through it. I was thinking of making a Pachinko type game out of them.
I see you corrected the statement about mass being equal on all sides of the center. Not to be picky, but the shape made by the object thrown at 0:23 is y=-x^2, not y=x^2.
***** That's not being picky, that's kind of obvious. But at an introductory level, I think it is good enough if they can make the generalized association of x² with a parabolic shape. I hope I don't get sick of explaining these things. One thing is for sure, I'm never making a physics video during a hangover again.
pocket83² I'm always so reluctant to offer criticism when not face to face no matter how constructive I consider it to be. Sometimes it can be a hornets nest, you took it really well though. I have seen all your videos and based on that I assumed the omission of the negative sign was accidental or for simplification purposes, and not due to a lack of your knowledge. Anyway, love the vids, especially the easter eggs. Keep up the great work!
***** That depends on how you define you coordinate system. What is there to say that the arbitrary direction called "down" in the physical world needs to correspond to decreasing values of y?
Gameboygenius You're right. There is nothing that truly designates North as "up," either; it is just the agreed upon standard (by a mostly northernly biased people). But we need our standards to communicate effectively. ***** was pointing out a useful possible criticism based on convention, and that is important to keep me on my toes. In fact, I had to take the first version of this video down because of an error in the dialogue.
What do you do for a living pocket? Just curious as you seem very scientific, and very practical at the same time which leads me to think you studied physics at some point.
Insederec Finding the center of mass on one face of it would be basically the same. If you wanted to find the center of mass of the object in three dimensions you'd need to do this on multiple faces and connect the centers of mass on opposing faces. They'd all intersect in the 3D center of mass, but that's a little hard to do with real objects rather than theoretical ones.
Lyonhardht Great idea, but I am NOT re-shooting any scenes for this video! This one was supposed to be a quickie, and it turned out to be a nightmare to film.
1) Here on Earth, usually, sort of, yes; but a c.o.g. is more often treated as a line, or a vector. 2) Assuming you are asking about 3-D objects: Think of the center point on a square. You can find it by simply connecting its corners diagonally. This point is called its _centroid,_ and that's where the center of mass will be for anything square that's (nearly) two dimensional. Now imagine the point that's at the center of a cube. That point will be the cube's center of mass, through which is also its center of gravity (whenever the cube hangs from something here on Earth and thus points towards the Earth's own c.o.m.); geometrically, we can also locate this point by connecting all of a cube's diagonals, but this is the point where all of the cube's squares' centroids intersect. In other words, you have to sort of skewer, or hang, an object along three dimensions in order to find its true center of mass. As such, in real life, finding a 3-dimensional object's c.o.m. is tricky. We can discuss further details if you're still with me at this point.
hizo64HH Because he is actually teaching you how to practically find the center of mass on a real object, where as your math teacher was trying to teach you how to theoretically do so on an imaginary object. A lot of people are better with practice than theory.
Hey pocket, you might be interested in a piece of software I've been playing around with. ProDad ReSpeedR emulates 1000 fps and creates some incredible slow motion footage with what you have (even filmed at 30 fps). Just thought I'd share, in case you'd like to do some more slow motion.
Awww the second subliminal message I've caught watching your vids. What did the shot of the chrome sphere mean in the, for lack of easier words to type, soccer ball puzzle video?
When i was a kid i started thinking about phisics when my father gave me a piece of wood whose center of mass wasn´t a part of the piece. The piece of wood you show is preaty much the same shape.
technically, by drilling holes, you changed the center of the mass of the stick very slightly. So you could say that you changed the outcome of your test by measuring it.
Technically, the flaws inherent to any experiment don't end: Red Sharpie ink added mass to the object. The knot on the plumb line affected the outcome of its position. Atmospheric conditions that day altered the moisture content of the wood, causing it to become slightly different from the day before. Sunlight, wind, and heat slowly erode the plywood, knocking agitated molecules and individual atoms away from its mass, in a slow but endless process of diffusion. Spherical aberration of the camera lens (and human eye) makes it impossible to capture a parabolic path and then relay it to a planar screen. My breathing altered the result. Oh, and then there's relativity, and that whole mass causing a dent in space-time thing. Welcome to an imperfect world! Thankfully we can express ideas conceptually, and not always remain beholden to ideals, like perfection.
Hmm- not if one side's a handle! Hey, you're right about the third hole, so all three should be drilled first, but it's so small it won't make a difference that you could detect within a pencil mark.
There's a beautiful video of an MIT professor throwing irregularly-shaped objects around in the dark, while their center of mass is lit up with a little LED. EDIT: It's colored with florescent paint. watch?v=DY3LYQv22qY (1 minute long)
+KingWorstie Maybe _you_ should try making a video that is both informative and entertaining. You might want to work on sentence construction first, though. Good luck!
Stew Pidass The parabola is a confluence of the multiple forces and mathematical principles that quietly govern our reality; it's the end result of a whole bunch of stuff, and we are lucky enough to be able to recognize the overall pattern. As for those flat-Earthers: I don't have time to watch all of that, but from what I understand, it is just a rhetorical exercise, like when (in debate) you argue as the Devil's advocate for the sake of refining your skill in formal argument. I do that sometimes in the YT comments. No rational person would actually take that stance, but as John Locke once asserted, there will always be "idiots and children" who will not assent to even the most basic truths.
Hello Ilayda. He is showing how to find the balance point on a flat piece of board. Imagine a see-saw with one person heavy and one not. It shows where is the middle point
Tommy Evans Of course, it is one of a million possible design considerations while making any object of function. But in this case, there are so many other considerations that John took into account first, because they were _much_ more important. Successful engineering is, in general, the fair evaluation of design elements to optimize efficiency. So then, why are we not nearing an optimum on the designs of our commodities now? Well I'm glad you asked! But I'm not answering that right now, because it makes me angry. Short answer: Now we engineer _profit,_ not product.
joe chu Yes, but x² is just a generalized version of a parabola. It's the thing that you see that tells you that a parabolic shape is in this graph somehow. A negative sign is just a multiplication by (-1), so it's just a transformation to the generic "form" of it. I just wanted to keep it basic for people who wouldn't know to think about that.
Whoever you people are who liked this in the first two minutes I posted it are awesome! Sorry about the re-up.
I'm gonna have my center of mass tattooed on me. I just gotta decide where to drill the holes...
You need Jesus...
He knows about where to be hung up by holes.
OminousPineapple savage.
You have 69 likes right now... Just so ya know
@@OminousPinapple I am dead . You win youtube comments XD
As always, very interesting!
Now that's a push stick:)
John Heisz Thanks, John. The plan for it is only $2.99 if you want to download a copy!
Just kidding. I put a link at the end of the video for you. Glad you watched ;)
John Heisz That's a flippin' push stick!
Boring af
I think I realize why I like you better than other TH-camrs. Your work makes me think, but it's also interesting. It's rare that intellectual and interesting mix in my experience, but I've been hooked on your videos.
I've said it once and I'll say it again, I've learned more watching vids like this than when I was at school. Great stuff mate and thanks
I'm going to work out the centre of mass on my swan neck push stick around this weekend, and then throw it around. Great video!
I love your videos Pocket, I've never really been very big into wood working, but you have a voice and a personality that makes it impossible to stop watching. Keep up the amazing work.
Very succinct. Thank you for the new perspective. I could see how this could really help with planning a balancing sculpture.
This was brilliant and I loved every bit of it.
Best Wishes, Brendan.
baconsoda I'm glad you liked it. How is it that my bizarre content and nasty commenting habits haven't driven you away yet? You must be a glutton for punishment! I really do appreciate the support- thanks.
pocket83² I like people who don't feed me bullshit and that I think I can trust so I like you.
Wow, you're a young version of "Ask Mr. Wizard." I learned more watching his Saturday half-hour TV show than I did in a month of ossifyingly-boring science classes in school. BRAVO!!!
This inspired me, thank you. Laminas, centroids, and center of masses are cool to learn now.
FRICKIN' SCIENCE, BRO. Thanks for the video(s), really did seem interesting. As unintellectual as I am regarding physics, your videos are always fascinating and informative. Just another subscriber to support you til' the end. Even by then, haha
Emman Pascual I appreciate it! Glad it kept your interest.
I remember being fascinated with this method as a kid after seeing it in one of Martin Gardner's books. Thanks.
Thanks for redirecting my view point on objects. Great video.
Really good description and instruction. (Did drilling that third hole SLIGHTLY shift the center of gravity by removing some material on one side of the center lines?)
Jeremy McMahan Of course it did. But how far are we taking the details here?
It was more of a theoretical question than one of practicality.
Jeremy McMahan I gotcha ;)
so... what must i do to get you to make me one of those metroid upgrade stations at 2:10? would prefer a super metroid one...
Cool!
It was interesting. . :-)
So that's how one finds the center of mass (besides trying to hunt for a balance point). Very interesting.
Thanks for the video. I learned something new. A simple effective method to find c of m. I wish I had some geometry teachers like you when in school.
Your videos are always interesting.
Exactly what I was looking for. Thank you!
Ahhh....a tingling in the grey matter I rarely need to use at work. :) Thanks!! Very nice!
Awwww... i thought your second channel would be harder to find. I thought the clue was the Pixel image in the background of some of your shots (the dark green one holding a ball). I even took a screen dump and used google image search to try and find it because i didn't recognise what it was...
...and it turns out that the link was in your signature.
BTW, your channel is awesome :-)
This is awesome, I just shared it with my woodturning group.
that is so interesting! well how about the center of mass of an irregular shape varies with change of radius? can you help me on this one please
Great Video. Now I understand how I might have tackled one of the problems on my college physics exam some 42 years ago. " where is center of mass if the earth were made of half lead and half wood" . Duh get the string.
Wow! What a great video. So well explained and thought out.
I love your videos man keep creating you share so many great tips and knowledge thank you!
Thanks for sharing this informative video.
What if the mass was not evenly distributed amongst the object? Would this method still work?
dporiua Yes, it will
dporiua You won't be able to mark it with that red pen.
That was very interesting, thanks for putting in the time to make this video, I really appreciate it...
Great video. I love information. Keep up the good work.
Been wanting to know this for years... Thanks
0:44 SNES Nostalgia, never forget!
Digging the Chozo Statue, did you make that or get it somewhere?
Josh Rowlison That is made from Perler beads. Possible future update to wood, though.
Ah, I should have looked closer, I did a lot of Perler bead fractals as a kid, nothing that cool.
I wonder if resin encased Perler bead pixel art has been done much.
Great video it was interesting and explained very well. Thank you for your hard work.
Where did you get that tuning pin from?
GeneralSeptem Nice catch. But since you know what it is, it would be fair for me to assume that you know where it came from. It works perfect; it's heavy, symmetrical, and it has a hole through it. I was thinking of making a Pachinko type game out of them.
U should be a geometry teacher cause ur too amazing with crafting
Interesting, and when I get information in this format it sinks in, just the way I learn.
Thank you for the educational video.!
excellent explanation man that helped a lot !!!
I see you corrected the statement about mass being equal on all sides of the center. Not to be picky, but the shape made by the object thrown at 0:23 is y=-x^2, not y=x^2.
***** That's not being picky, that's kind of obvious. But at an introductory level, I think it is good enough if they can make the generalized association of x² with a parabolic shape. I hope I don't get sick of explaining these things. One thing is for sure, I'm never making a physics video during a hangover again.
pocket83² I'm always so reluctant to offer criticism when not face to face no matter how constructive I consider it to be. Sometimes it can be a hornets nest, you took it really well though. I have seen all your videos and based on that I assumed the omission of the negative sign was accidental or for simplification purposes, and not due to a lack of your knowledge. Anyway, love the vids, especially the easter eggs. Keep up the great work!
***** That depends on how you define you coordinate system. What is there to say that the arbitrary direction called "down" in the physical world needs to correspond to decreasing values of y?
Gameboygenius You're right. There is nothing that truly designates North as "up," either; it is just the agreed upon standard (by a mostly northernly biased people). But we need our standards to communicate effectively. ***** was pointing out a useful possible criticism based on convention, and that is important to keep me on my toes. In fact, I had to take the first version of this video down because of an error in the dialogue.
What do you do for a living pocket? Just curious as you seem very scientific, and very practical at the same time which leads me to think you studied physics at some point.
But how do you find the center of mass for a non-uniform object, or one that has three dimensional features?
Insederec Finding the center of mass on one face of it would be basically the same. If you wanted to find the center of mass of the object in three dimensions you'd need to do this on multiple faces and connect the centers of mass on opposing faces. They'd all intersect in the 3D center of mass, but that's a little hard to do with real objects rather than theoretical ones.
Interesting question.
Thanks for the video.
If you used a reflective sticker or used a strobe light (at night) the parabola and C.O.M. might be easier to see.
Lyonhardht Great idea, but I am NOT re-shooting any scenes for this video! This one was supposed to be a quickie, and it turned out to be a nightmare to film.
Learned something new! Thanks
I fucking LOVE science! An another winner from you!!
great way for finding single hang point for a mobile. one that is made from say a piece of drift wood. or curved branch.
Is COM = CG?
How can we find the C.G?
1) Here on Earth, usually, sort of, yes; but a c.o.g. is more often treated as a line, or a vector.
2) Assuming you are asking about 3-D objects:
Think of the center point on a square. You can find it by simply connecting its corners diagonally. This point is called its _centroid,_ and that's where the center of mass will be for anything square that's (nearly) two dimensional.
Now imagine the point that's at the center of a cube. That point will be the cube's center of mass, through which is also its center of gravity (whenever the cube hangs from something here on Earth and thus points towards the Earth's own c.o.m.); geometrically, we can also locate this point by connecting all of a cube's diagonals, but this is the point where all of the cube's squares' centroids intersect.
In other words, you have to sort of skewer, or hang, an object along three dimensions in order to find its true center of mass. As such, in real life, finding a 3-dimensional object's c.o.m. is tricky. We can discuss further details if you're still with me at this point.
I really enjoyed watching that...I haven't a clue why! I´m not sure that I will ever have the need to find the centre of mass ;)
You are so awesome! U helped my physics hwk so much!
Why did it take a TH-cam build video to teach me more than my Math teacher ever did?
hizo64HH Because he is actually teaching you how to practically find the center of mass on a real object, where as your math teacher was trying to teach you how to theoretically do so on an imaginary object. A lot of people are better with practice than theory.
Nice explanation
Digging the chozo in the background.
Hey pocket, you might be interested in a piece of software I've been playing around with. ProDad ReSpeedR emulates 1000 fps and creates some incredible slow motion footage with what you have (even filmed at 30 fps). Just thought I'd share, in case you'd like to do some more slow motion.
But what are the little cubes for?
Majoofi Visual interest/appeal. Also to confuse the Easter-egg hunters who were so sure that the Yellow-pine cubes must be illusory.
Awww the second subliminal message I've caught watching your vids. What did the shot of the chrome sphere mean in the, for lack of easier words to type, soccer ball puzzle video?
thanks, very cool, clear, educational
Nerding out!
Did you delete the video then reap load it?
Reupload*
Patrick Kawa Yep. I made a mistake in the dialogue.
Thanks for this... useful stuff!
Thanks man! This was helpful!
When i was a kid i started thinking about phisics when my father gave me a piece of wood whose center of mass wasn´t a part of the piece. The piece of wood you show is preaty much the same shape.
Keep up the great videos :D
Dinofuzz11 I will try! Thanks.
No problem! Your works have been very inspirational and you explain physics and just simple concepts very well in your videos
Does a ballon with water in it have a centre of mass?
Sure. Everything with mass does. It might change position over time, but it's in there.
Great video Pocket
Neat concept!
Thanks for the video. It is going help me in my exam
Tnx man! That was indeed very interesting!
Thanks alot for this video ,it helped alot
neat trick
Well done...
As I get older, my center of mass seems to be changing...
technically, by drilling holes, you changed the center of the mass of the stick very slightly. So you could say that you changed the outcome of your test by measuring it.
Technically, the flaws inherent to any experiment don't end:
Red Sharpie ink added mass to the object. The knot on the plumb line affected the outcome of its position. Atmospheric conditions that day altered the moisture content of the wood, causing it to become slightly different from the day before. Sunlight, wind, and heat slowly erode the plywood, knocking agitated molecules and individual atoms away from its mass, in a slow but endless process of diffusion. Spherical aberration of the camera lens (and human eye) makes it impossible to capture a parabolic path and then relay it to a planar screen. My breathing altered the result. Oh, and then there's relativity, and that whole mass causing a dent in space-time thing.
Welcome to an imperfect world! Thankfully we can express ideas conceptually, and not always remain beholden to ideals, like perfection.
This was interesting.
Super demo
Je ne vois pas le rapport avec la position du centre de gravité et le fait de lancer l'engin.
La parabole formée suit le centre de gravité et correspond au calcul y=x2...
I like your video!!!
Nice vid
Thank you.
Awesome.
Thanks!
Once you drill a third hole, you change the center of the mass.
So does adding fingerprints to it.
but you touch it all over randomly, so it is safe to assume all fingerprints cancel each other.
Hmm- not if one side's a handle! Hey, you're right about the third hole, so all three should be drilled first, but it's so small it won't make a difference that you could detect within a pencil mark.
Thank you
VIDEO INTERESSANTE.
FISICA/FALEGNAMERIA.
SALUTI
SALVIO
WTF !! How did you make physics interesting ?!?!
There's a beautiful video of an MIT professor throwing irregularly-shaped objects around in the dark, while their center of mass is lit up with a little LED.
EDIT: It's colored with florescent paint. watch?v=DY3LYQv22qY (1 minute long)
Edan Coll Thanks, that was a really good way to demonstrate it! My video is still better, though. lol.
+pocket83 its actually not..,
+KingWorstie Maybe _you_ should try making a video that is both informative and entertaining. You might want to work on sentence construction first, though. Good luck!
pocket83 i wonder how you can live like a normal human being when every time you look in the mirror you get a hard one from yourself
+KingWorstie Wow, sounds as though you have a winning personality! Your viewers are going to love you. Post a link when you're finished!
is the parabola the result of gravity... or is it merely density? What do you make of this: th-cam.com/video/G90A2kg1bWs/w-d-xo.html
Stew Pidass The parabola is a confluence of the multiple forces and mathematical principles that quietly govern our reality; it's the end result of a whole bunch of stuff, and we are lucky enough to be able to recognize the overall pattern.
As for those flat-Earthers: I don't have time to watch all of that, but from what I understand, it is just a rhetorical exercise, like when (in debate) you argue as the Devil's advocate for the sake of refining your skill in formal argument. I do that sometimes in the YT comments. No rational person would actually take that stance, but as John Locke once asserted, there will always be "idiots and children" who will not assent to even the most basic truths.
love it
I'm deaf please someone explain what does he saying🙏
Hello Ilayda. He is showing how to find the balance point on a flat piece of board. Imagine a see-saw with one person heavy and one not. It shows where is the middle point
IDK how he knew where to make the nailhole
yep, found the link
Flopper flopper 😍
pocket83 is pocket83² your second channel?
neat
Center of mass is not the same thing as centroid.
Pedantry is not the same thing as cleverness.
hmm, so that brings up the question of where the center of mass should be on a safe push stick. seriously
Tommy Evans Of course, it is one of a million possible design considerations while making any object of function. But in this case, there are so many other considerations that John took into account first, because they were _much_ more important. Successful engineering is, in general, the fair evaluation of design elements to optimize efficiency.
So then, why are we not nearing an optimum on the designs of our commodities now? Well I'm glad you asked! But I'm not answering that right now, because it makes me angry. Short answer: Now we engineer _profit,_ not product.
who noticed the chozo statue?
but...y = -x^2
joe chu Yes, but x² is just a generalized version of a parabola. It's the thing that you see that tells you that a parabolic shape is in this graph somehow. A negative sign is just a multiplication by (-1), so it's just a transformation to the generic "form" of it. I just wanted to keep it basic for people who wouldn't know to think about that.
i simply thought that having "y = - x^2" would make it much easier, faster, and apparent to understand
Chozo statue.
Lol I got the link