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Welcome to Bleeping Computer, a free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.| Important Announcement: The winners of the BC Million Post contest have been announced. You can read who the winners are at this post. - BleepingComputer Management |
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 Dec 17 2006, 12:52 PM
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#16
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 To INSANITY and BEYOND !!  Group: Moderator Posts: 9,296 Joined: 10-September 04 From: NJ USA Member No.: 2,608  |
-------------------- Can you spare some PC cycles to help FIND A CURE .. BC FOLDING TEAM Click me /info..
ThoughtVent a goodplace to discuss.<<>>>Staying Updated Calendar of Updates. For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear.... |
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Dec 17 2006, 02:37 PM
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#17
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 "Bleepin' Aussie Addict" Group: Members Posts: 2,083 Joined: 14-October 06 From: SYDNEY-AUSTRALIA Member No.: 90,018 |
QUOTE(boopme @ Dec 18 2006, 04:52 AM)  Hi DSTM, I hear ya and certainly am not trying to dispute you're knowledge. I have 0 engineering experience. I don't believe the tires rolling up hill part. To me I would think the two rubber surfaces on that angle would stick. I was just pointing out that as I was trying to find info on that my brother passed me the snopes link. As I can't figure the trickery in the beer can and I don't see lightning go up as they say it does ... sometimes I'm just amazed. I appreciate your knowledgeable input. You are dead right about the tyres sticking on contact.Well done,I can see you are a thinker.Boopme. Picture 2 tyres travelling in the same direction.when the two tyre surfaces touch, the surfaces are travelling in opposite rotation,at point of contact.The contact point of the rear tyre and the front tyre will act as a brake for a split second on contact.Stick like you said.Rubber against rubber.Easier to draw 2 circles touching and draw arrows next to point of contact,and you will see they are moving in opposite directions,although the wheels are still travelling in the same direction. I will give the makers of that ad the benefit of the doubt that they didn't use computer trickery.They just used trickery,without a computer IMHO. If asked,I would be happy to give you my take on how I think this, what looks like being "contary to the law of physics" was pulled off. DSTM. --------------------  I once had a life.. now I have the Internet... |
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Dec 17 2006, 08:11 PM
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#18
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 Forum Addict Group: BC Advisor Posts: 1,875 Joined: 25-November 04 From: Finland Member No.: 5,870 |
Now I don't have any engineering experience. I even spent all my physics courses programming games on my calculator. But I just couldn't stop thinking about the wheels (I'm obsessive like that), and think I may have figured it out. Could somebody say if and how I've gotten everything wrong.
We got two tires, Tire A and Tire B, where tire A is rolling forward and tire B is standing still. The fron of tire A is then moving downwards and when it hits tire B at point C it will start to push the back of tire B downwards as well, thanks to the stickiness of the rubber. The stickiness of tire B at point D will help keep tire B stationary. Now since rubber is elastic tire A will compress the part of tire B between point C and point D until it runs out of momentum. The portion of tire B between point c and point D will then expand, pushing against point D and thus giving tire B the moment needed to roll forward. 
-------------------- "Anyone who cannot form a community with others, or who does not need to because he is self-sufficient [...] is either a beast or a god." Aristotle
AMD Athlon 64 X2 4400+ | ASUS A8N-SLI Deluxe | 2GB Corsair TWINX2048-3500LLPRO | Gigabyte GeForce 8800GTX | Creative SoundBlaster Audigy 2 ZS | ASUS PhysX P1 | Logitech G15 | Logitech MX Revolution | LG Flatron L2000C | Logitech Z-5500 Digital Stubborn attempts to think clearly |
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Dec 17 2006, 09:13 PM
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#19
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 Forum Regular Group: Members Posts: 332 Joined: 27-June 04 From: Directly above the center of the Earth Member No.: 1,032 |
The tires are simple, they have a weight inside them balanced at the top. Look at how they behave as they move forward, they start slow, then as the weight inside them gets farther from its center of gravity (out toward the two or three o-clock position) they speed up. After starting the next tire rolling they continue to move uphill until the weight is on the bottom (you can see this clearly with the middle tire on the ramp).
As for the cogs, we don't know how fast or how far the first cog traveled (how much momentum it had to impart) before hitting the second cog and the board it was on was definitely tilted to boot. Nothing in that video looked impossible to do, it is all about balance and transmitted force. On a different note years ago on public television someone did an art film that did many of the things that were done in this video and many more. I wish I could remember the name of it but it was done in the mid seventies and lasted about 15 to 20 minutes or more. If anyone else remembers this film I would appreciate it if you post the name of it here. -------------------- |
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Dec 17 2006, 10:00 PM
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#20
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"Bleepin' Aussie Addict" Group: Members Posts: 2,083 Joined: 14-October 06 From: SYDNEY-AUSTRALIA Member No.: 90,018 |
QUOTE(Ronbo @ Dec 18 2006, 01:13 PM) The tires are simple, they have a weight inside them balanced at the top. Look at how they behave as they move forward, they start slow, then as the weight inside them gets farther from its center of gravity (out toward the two or three o-clock position) they speed up. After starting the next tire rolling they continue to move uphill until the weight is on the bottom (you can see this clearly with the middle tire on the ramp). As for the cogs, we don't know how fast or how far the first cog traveled (how much momentum it had to impart) before hitting the second cog and the board it was on was definitely tilted to boot. Nothing in that video looked impossible to do, it is all about balance and transmitted force. On a different note years ago on public television someone did an art film that did many of the things that were done in this video and many more. I wish I could remember the name of it but it was done in the mid seventies and lasted about 15 to 20 minutes or more. If anyone else remembers this film I would appreciate it if you post the name of it here. Ronbo,Well done. You are dead right IMO..I have just this minute logged on and you have saved me the time to explain everything in detail.With out an internal weight,to give the energy needed,the tyres would virtually go no where.because uphill and made of rubber the rear tyre is braking the front one and like Mr Alpha said compressing the front one,to a minor degree. What the rear tyre is trying to do because of the grip is trying to climb the front tyre momentarily,taking away a lot of the energy needed to propel the second tyre forward at the desired speed. Ever watched open wheeler racing cars, when the rear cars tyre contacts the rear tyre of the car in front.The rear cars front tyre compresses the car in front's rear tyre, and immediately climbs up the tyre and becomes airborne.I know this example is extreme,only giving an example. So without internal weight at a given point inside the tyre,nothing much is going far at all.Around 2 o'clock seems about right to me.Strap weights to the sides of a tyre,set the weight at around 2 o'clock,let go and watch it accelerate so fast,all by itself.Only for a short distance of course. I find all this so interesting, because you never stop learning. This post has been edited by DSTM: Dec 18 2006, 03:38 AM -------------------- I once had a life.. now I have the Internet... |
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