“For an object we’re gonna be using the state of North Carolina” is the most unusual sentence I’ve heard today and he says it like it’s something he does every Tuesday.
Actually no... equations are the ones who wont work if those are unknowns. This experimenthal method will always givve out the center of mass. However the difficulty lies in drawing those lines, however you can still measure the angle respect a fixed line in the object by which it rotates and trigonometry will solve the rest.
This is great. There is something coldly super-villain-ish about picking up a geographic region and calmly stabbing it with a pin in order to answer a question whose purpose is not revealed. My question is: how do you do this with something other than mass? Eg can you find the “centre of human population”?
Yes, but doing this with a physical demonstration wouldn’t make sense and isn’t very practical. But if you’re curious, there are resources showing such a point for the US and in every US state and county as of the 2020 census
hold the glass with your finger if you can and feel when the object has no tendency to rotate around your pin. You'll get approximately the same result. Or just simply guess the CoM and put it on top of a thin pillar and moves around to see at which point the glass stabilizes.
Can you explain mathematically why we can always find a line through a lamina (eg a horizontal line y=a in some coordinate system on the lamina) such that the moments on either side of this line sum to zero. It's intuitively obvious physically (hanging plumb lines etc) as you describe here but I just can't prove this mathematically. The mathematics involves the integral of all the moments of every point mass of the lamina on either side of such a line, putting this integral equal to zero and solving for the coordinate of the centre of mass. But why can we always assume we can put such an integral equal to zero in the first place.
I don't have a passport sadly. So on the off-chance that someone lives in that place in NorthCarolina that the thing was pointing to...What happens when you go there with your centre of mass on this irregular object ? Thank you
Finding the center of mass of such asymmetrical objects, is contingent upon it's described attraction to the center of an oblate spheroids mass, earth. Though how does one find the center of mass, of the asymmetrical oblate spheroid, itself?
Doesn't that just find the center of mass on a plane, i.e. on a single axis? Your map is basically flat. If I wanted to find the center of mass on an irregularly shaped three-dimensional object with irregular weight distribution, wouldn't I need a more complicated system of measurement to find the center of mass along two axes, i.e. two intersecting planes?
+Masked Marvyl indeed that is what came to my mind immediately I saw the map. I think this is the procedure of locating the center of gravity. I am trying to imagine something almost like a sphere but not and what the procedure would be.
in 3d objects you can find CG usig same procedure but by changing the plane of experiment. 1st you have to do it in suppose XY plaane you will get Xcg and Ycg then repeat it in YZ plane to get Ycg and Zcg.
Tie a rope on your bike between the seat and handle bar. Lift it up from that rope and try to find the spot where it can lift both tires at the same time and same height. That is your center of gravity.
Okay great. Now show the center of gravity on the same board so we can see clearly the difference between the two. Isn't that the right thing to do? This was an interesting video I must admit. You never once brought up the word gravity. Most folks start with mass and end up talking nothing but the center of gravity with the words mass mixed in. And if you pay any attention only then you get to enjoy being confused.
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“For an object we’re gonna be using the state of North Carolina” is the most unusual sentence I’ve heard today and he says it like it’s something he does every Tuesday.
Must have studied in Theater
It's better to learn practical than imagining ...i like it .
same
exactly
thank you so much this is part of my sylabis for GCSE physics and i didnt understand the diagram on the book
Yash Nanda At least you had a diagram man, I’ve got notes that makes no sense
Yash Nanda yes that is very true. Even I am doing gcse and I didn’t understand
Hi present you
Sylabis?
Thank you! This helped me understand what my Conceptual Physics book was talking about.
works only if the density, and thickness of the medium is a constant.
Actually no... equations are the ones who wont work if those are unknowns. This experimenthal method will always givve out the center of mass. However the difficulty lies in drawing those lines, however you can still measure the angle respect a fixed line in the object by which it rotates and trigonometry will solve the rest.
@@Michallote I think we actually agree
needed this for physics
I keep trying this on my balloon ..it doesnt hold the pin
Try it on ur balls
freakyflow 😂🤔
simply excellent! im using this method for quadcopter stuff and it truly helps. Thanks a bunch for the video, keep up the good work. :)
Thank you. This helped me with my t-shirt business and trying to center irregular images.
Wow, that's an interesting story! I think it's pretty cool that Physics helped you with your T-Shirt company.
thank you! this helped my GCE physics revision.
This is great. There is something coldly super-villain-ish about picking up a geographic region and calmly stabbing it with a pin in order to answer a question whose purpose is not revealed. My question is: how do you do this with something other than mass? Eg can you find the “centre of human population”?
Yes, but doing this with a physical demonstration wouldn’t make sense and isn’t very practical. But if you’re curious, there are resources showing such a point for the US and in every US state and county as of the 2020 census
Brilliant! Thank you for the demonstration.
How can I find the center of mass if I can't put a pin in my object? (it's glass)
hold the glass with your finger if you can and feel when the object has no tendency to rotate around your pin. You'll get approximately the same result. Or just simply guess the CoM and put it on top of a thin pillar and moves around to see at which point the glass stabilizes.
suction cup
Thank you so Sir
You have resolved my big problem through this small and simple video
Thanks a lot for being on TH-cam
Can you explain mathematically why we can always find a line through a lamina (eg a horizontal line y=a in some coordinate system on the lamina) such that the moments on either side of this line sum to zero. It's intuitively obvious physically (hanging plumb lines etc) as you describe here but I just can't prove this mathematically. The mathematics involves the integral of all the moments of every point mass of the lamina on either side of such a line, putting this integral equal to zero and solving for the coordinate of the centre of mass. But why can we always assume we can put such an integral equal to zero in the first place.
very informative, thanks for sharing
2:53 the man is stabilizing the map with his finger
the man has no desires.
I don't have a passport sadly. So on the off-chance that someone lives in that place in NorthCarolina that the thing was pointing to...What happens when you go there with your centre of mass on this irregular object ?
Thank you
I mean they point in NC isn’t anything special
Does anyone know who the professor is?
How would you find com in space?
Finding the center of mass of such asymmetrical objects, is contingent upon it's described attraction to the center of an oblate spheroids mass, earth. Though how does one find the center of mass, of the asymmetrical oblate spheroid, itself?
thank you for the demonstration ,it really helped a lot !!!
i dont get it, i have a "Γ" shaped plan and i need to find the center of mass, yet it doesnt seem to work for me
Good, Good... Now, as an european, i know that North Carolinas center of mass is the city of Sunford... this shall help me a bunch in life.
I dont understand why you drew a third line.you can draw a third line through a cross even if it is not the centre of mass.understand what i mean?
Doesn't that just find the center of mass on a plane, i.e. on a single axis? Your map is basically flat. If I wanted to find the center of mass on an irregularly shaped three-dimensional object with irregular weight distribution, wouldn't I need a more complicated system of measurement to find the center of mass along two axes, i.e. two intersecting planes?
+Masked Marvyl indeed that is what came to my mind immediately I saw the map. I think this is the procedure of locating the center of gravity. I am trying to imagine something almost like a sphere but not and what the procedure would be.
in 3d objects you can find CG usig same procedure but by changing the plane of experiment. 1st you have to do it in suppose XY plaane you will get Xcg and Ycg then repeat it in YZ plane to get Ycg and Zcg.
ty, i have my physics exam tomorrow!
What if your string was shorter?
I think now I get it
How we do this with a heavy rock?
Needed this for my Kinesiology class (Biomechanics Unit) lol. Y'all saying it is for physics
What if it's a hard and we can't pin?
0:57 that video bug?
Not a video bug. He's an alien and did something .
@@funkblack bruh😭
@@abdoulietaal985 i don't even know
Wonderful tutorial
Anyone else find this kinda relaxing?
Very usefull for planes and stuff. Thanks for this nice demonstration, allthough i am not going to use a needle.
umm.. why must the intersection of the lines be the center of gravity?
because that is where the mass of the whole object appears to be aka center of mass (sry im writing after 7 years lol)
Very nice. Thank You
Quite incredible.
Thats great. I learnt a lot
This helped a lot
Brilliant, Thanks.
man said he pulled out a whole state
Thanks king 👑
Thanks for the video
This video is peak America.
Tq
very cool
It's called a plumb bob.
you seen to be a part of WW2 . (just a joke not to offend anyone)
btw nice video
Thank You!
Amazing
thx for the information
can any one explain how to find center of mass of a bicycle.
Tie a rope on your bike between the seat and handle bar. Lift it up from that rope and try to find the spot where it can lift both tires at the same time and same height. That is your center of gravity.
thank you sir! :)
Integrales Dobles
Okay great.
Now show the center of gravity on the same board so we can see clearly the difference between the two. Isn't that the right thing to do?
This was an interesting video I must admit. You never once brought up the word gravity. Most folks start with mass and end up talking nothing but the center of gravity with the words mass mixed in. And if you pay any attention only then you get to enjoy being confused.
thankyou so muchh!
Thanks
HOW DO I CALCULATE IT WITHOUT A CAT'S TOY???
Any good 3D modeling software will have a tool for it. Without that, good luck for irregular objects if you're not gonna do an experiment.
asmr
inta 7mar
la jk you are smart
Eddieft9 😂😂😂
who else is here from the centre of mass power point
the first 19 seconds were the most awkward 19 seconds of my entire life.
I think you meant the last seconds? Because I don’t think he was able to balance the state?
hi sir
I was disappointed it didnt balance
instructions unclear, my dog ended up in the microwave
el dedito jajajaja
Ay ay ay ay me pica el
North Carolina Elections 2020
😂😂
beacuase science.
hahahaha!
hahaha
This gentleman looks very sad.
Thanks