Along the paper faster than the paper

[BraDRoBBo]

Such a brilliant voice, I'm subscribing to you in the hopes that you'll come back fromy our 2 year hiatus.

[K0sm1cKid]

so soothing ^-^

[meniusg]

Oh oh, I get it! The middle of the wooden wheel is smaller than the outer edges, so when the paper strip moves the wheel, it makes it turn more times per inch of the paper. Wow. You are incredible with your constructivist teaching magic. I must have more!!!

[cclementi6]

I feel like the paper is curved, so the curve pushes the spool forward, instead of the friction between the spool and the paper pulling it. Maybe a straight, metal/wooden slat would help...

[SteBrazier2K9]

0:53 onwards - most relaxing

[julesgzu]

@SteBrazier2K9  I just fell in a state of trance when he said "Underneath"

[27Cobalt]

Please make more demonstrations!

[helloiamdavey]

BE MY PHYSICS TEACHER

[Jezuzac]

Chemical engineer helped me figure it out.

[andyneverdies]

1 person is deaf

[readingislife]

such a soothing voice.

[MultiplePersonas]

Heh. All these comments about Michael's classic and melodious Oxford English cracked me up. Will have to rib him about it on TalkRational, where the debate over whether a wind driven cart can exceed wind speed going directly downwind is has now over 30,000 replies

[Angaraman]

pretty simple physics, actually. the middle of the cotton reel has a smaller radius than the outside. it basically functions as a gear.

[iggymydog]

so its simple physics

[platypus128]

i would pay to have someone i know with a vioce like this, whenever i couldn't sleep i would call them in and say talk you should make just voice recordings of you talking, and sell them on itunes. Iwould buy it

[petewentzrocksmyworl]

Haha I thought I was like the only person who luved this guys voice soo much but apparently I'm not based on the comments. I feel soo good after watching these videos

[132ally132]

make more vids

[TheOnlyGM]

Nierla is right, please make more videos.

[Nierla]

i must agree to the other users. you have got a beautiful voice and your videos are very interesting. i'm looking forward to more videos from you. (sorry about the bad english, i'm from germany...)

[chewinggum2001]

I love your voice, I could listen to it all day!

Please make a meditation video or something!

[sacredsword42]

i agree about your voice it is the most relaxing one ive evr heard seiously, if I were you id make a meditation recording like redvsblueviewer suggested

[ForFreakingPhenna]

Same 0_o

[TheEditingShop]

This guy does have the most relaxing voice. . .

[redvsblueviewer]

its amazing! youre voice just relaxes m so much. if you ever make a meditation recording or record a book. im buying it.

and your clips are very interesting too. i lear a lot from them. thank you.

[rosessmiles]

I agree beautiful voice - You should record a guided meditation story over soothing music it would be a bestseller. I love the monkey where can I get one?

Rose

Smiles x

[coolaun]

Terry isn't a monkey: he's an ape (he's very particular about that!). He came from Ty Beanie babies: I don't think they sell him any more, but you're sure to find him on eBay. Look for Schweetheart the Orangutan.

[GymnasticsISlife96]

make more vids. Ur voice is soooo relaxing. I have a vid of urs on my ipod and i listen 2 it before i go 2 sleep. U should be a hypnotist.

[fryguy2513]

me too i love his voice so much

[Jezuzac]

@rosessmiles

Its a beanie baby, you stupid whore

[steviewonder74CEA]

@Jezuzac if i am correct, that was explained a year ago. You didn't need to clarify.

[Fushiko]

You probably have heard this a lot, but your voice, is a Bob Ross like voice, in that your voice is not just soothing but almost to a sleeping state, you should read a book and record it or something XD as silly as that sounds, you do have a very relaxing voice. 2 points XD

[TimpBizkit]

Have you seen that kid's programme 'Old Bear?' (Read us a story old bear, come now gather round.... as the song goes).

He sounds a bit like the narrator in that/

[bassman123432]

this is my fav. of all your videos.....idk why i just like it better

[themasterbean]

your voice is so good for relieving stress

mmm

[89liam146]

i like his voice also, im sad i know but i downloaded his videos and set them up to replay ;) can you just do a video of your voice haha :)

[PHANTOM61994]

Can someone please explain this to me? I don't understand why the spool doesn't move the opposite way. When the paper pulls on it from the bottom, should that not make it turn away from the pull of the paper?

[coolaun]

Phantom61994, you can think of a rolling wheel as rotating, not around it's centre, but around its lowest point. The lowest point, touching the ground, has no forward velocity. If you push (or pull) at a point above this, it's like pushing on a lever. Depending on where you push on the lever, you can make the wheel roll faster or slower, but it will always roll in the direction you are pushing. Do some experiments yourself with rolling wheels and read through the other comments on this video.

[BenInVermont]

I heard one of your videos... your voice does wonders for my anxiety...

[Walkabout19]

You have a beautiful voice.

[iainw]

FAAAster than the paper lol.

nice vid made me think.

[SomeRandomAsianBoy]

FAASter than the paper lol

[symstym]

If you work out the math, the ratio of the spool speed to paper speed (both relative to ground) is R/(R-r) where R is the outer radius and r is the inner radius. So to make the spool go very fast, the inner radius should be close to the outer radius.

[chaumas]

"the ratio of the spool speed to paper speed (both relative to ground) is R/(R-r) where R is the outer radius and r is the inner radius. So to make the spool go very fast, the inner radius should be close to the outer radius."

Actually no. As r approaches R, R/(R-r) approaches 1. To make the spool faster, you need to *maximize* the difference between the two radii. In doing so, of course, you will reduce your torque.

[coolaun]

No, chaumas: as r approaches R, R/(R-r) approaches infinity. When r is zero, R/(R-r) is 1. Of course an r of zero isn't possible, it's a limiting case, but if r is close to zero, the spool will move at almost the same speed as the paper.

Increase r to R/2 (about the ratio here), and the spool goes twice as fast as the paper. Increase r to 3R/4 and the spool will go 4 times as fast as the paper. At some point, when r is too close to R, the paper will slip instead of making the spool turn.

[chaumas]

You're right. My brain must not have been working properly when I wrote that.

[proplayer98]

@chaumas WHAT!!!??

[cribley]

You should narrate audio books.

Nice demo.

[carlosnumber35]

I'd buy 'em.

[TheCarrotIsHere]

I am not as scientific as most of your other viewers..I think it is brilliant!

[thefearedone]

As usual "German engineering" does the trick ..

very nice and good explanation ...

Happy xmas to you and all the observers !

[thejeran]

OMG your voice is awesome!!! Sooooo.... Soooothing. Keep making videos i love your voice

[SFLogicNinja]

He is lifting the paper behind the spool.

This is a magic trick.

He uses his voice and stuffed animals to sell the con.

And he is VERY good. Simply watch the paper behind the reel, and this will make sense.

Don't believe someone just because they have a soothing voice and stuffed animals.

[weezermlmoore]

it's physics

[coolaun]

There's no magic trick here, no lifting of paper behind the reel. Anybody can make one of these little machines in a few minutes and try it out. The essential thing is that the strip of paper goes under the reel and touches it at the centre part. You'll need a reel where the centre part is noticeably thinner than the outer parts: the ratio between outer and inner radii is about 2 to 1 here.

[SFLogicNinja]

Yes, indeed you are right.

I misunderstood the experiment, so i did it myself. Of course, you are right.

It's been a long time since college. I'll just go back to doing what I do best. Writing music. I tend to be skeptically reactive, which I think the internet has poisoned me with.

Humbly *bows*

[J4ph3z]

I find myself doing the same thing, the internet messes with one's mind lol.

[metalhound69]

ya but he only has it a little lifted on the right the whole time so if you look even when hes moving it to the right its a little lifted on the right so its not a magic trick its physics as weezermlmoore said

[dohead123456]

Transmissions (i.e. torque converters) have been around for a long time. Why is this news?

[coolaun]

Yes, you could say that the DDWFTTW cart is simply exploiting a transmission that gears up the speed of the air relative to the ground: that is indeed my point here.

Nothing special? Go and have a look at the passionate discussions on BoingBoing, Randi Forums or physicsforums, where even some professors of physics assert that this isn't possible, and you may understand the fascination of the DDWFTTW debate.

[edleygear]

its special because of the animals dude!

[nullSoup]

I'm having a little difficultly understanding the setup. The reel has a smaller radius in the middle. Is that where the driver paper is touching the reel? In other words, are you lifting the paper off the table, so it touches the reel?

[coolaun]

Correct: the strip of paper touches the centre part of the reel, where the radius is smaller.

[miedvied]

*Why* does the cotton reel move faster than the paper? I've been following the debate on youtube and on the Good Math, Bad Math blog, but I haven't been able to get what (seems like) a simple concept.

[coolaun]

The paper is pushing at a point on the reel that moves *slower* than the reel as a whole. Look at the reel from the side as it rolls along the surface: any point above the centre of the wheel is moving faster than the centre point and any point below the centre of the wheel is moving slower.

[CousinoMacul]

Very nice!

[jsutdolph]

excellent minimal demonstration which simply shows the point

[spork33]

Very nicely done. Thanks!