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Duram
science forum beginner

Joined: 28 Jun 2006
Posts: 1

Posted: Wed Jun 28, 2006 12:13 am    Post subject: Domino Fall Speed

What is the domino fall speed?
How to figure knowing the domino size and the distance between them?
Is there any site about domino fall path construction, size records,
number of pieces records and other info´s?
Patrick Hamlyn
science forum beginner

Joined: 03 May 2005
Posts: 45

Posted: Wed Jun 28, 2006 1:37 am    Post subject: Re: Domino Fall Speed

"Duram" <danur@@ig.com.br> wrote:

 Quote: What is the domino fall speed? How to figure knowing the domino size and the distance between them? Is there any site about domino fall path construction, size records, number of pieces records and other info´s?

I recommend dropping the domino in a large tub of water. The fall speed will
then be easily measured with a stopwatch.
Mark Spahn

Joined: 07 Jul 2005
Posts: 62

Posted: Wed Jun 28, 2006 4:26 am    Post subject: Re: Domino Fall Speed

Come to think of it, this is an interesting question, although poorly
expressed. (What does "domino fall speed" mean?)
Let me try to restate the problem:
Given a straight row of dominoes, when you cause the first domino
in the row to topple, striking the next domino, which hits the next,
and so on, what determines the speed at which the wavefront of
toppling dominoes travels?
Can you vary this speed by changing the spacing between the dominoes,
the dimensions of the dominoes, the density (weight) of the dominoes,
the force with which the first domino is push over?
With standard-size and -weight dominoes, is this speed a constant?
If so, how many miles per hour is it?
Surely someone has considered and solved this problem long ago,
but where can one find a discussion of this intriguing puzzle?

-- Mark Spahn

"Patrick Hamlyn" <path@multipro.N_OcomSP_AM.au> wrote in message
news:69n3a2l3h6hg0ah1s3a5ahtno6q5tv66vn@4ax.com...
"Duram" <danur@@ig.com.br> wrote:

 Quote: What is the domino fall speed? How to figure knowing the domino size and the distance between them? Is there any site about domino fall path construction, size records, number of pieces records and other info´s?

I recommend dropping the domino in a large tub of water. The fall speed will
then be easily measured with a stopwatch.
jasen
science forum beginner

Joined: 28 Jun 2006
Posts: 16

Posted: Wed Jun 28, 2006 11:38 am    Post subject: Re: Domino Fall Speed

On 2006-06-28, Duram <danur@> wrote:
 Quote: What is the domino fall speed?

depends on size etc... plug innertia figures into kinematic formulae for
exact result.

 Quote: How to figure knowing the domino size and the distance between them?

ah topple-propogation speed, probably easiest to do tests

iirc wider spacing propagates slightly slower

 Quote: Is there any site about domino fall path construction, size records, number of pieces records and other info´s?

Guiness book of records would be a start.

--

Bye.
Jasen
--CELKO--
science forum beginner

Joined: 04 May 2005
Posts: 23

Posted: Wed Jun 28, 2006 1:42 pm    Post subject: Re: Domino Fall Speed

 Quote: Surely someone has considered and solved this problem long ago, but where can one find a discussion of this intriguing puzzle?

THE GEAT FALLING DOMINO BOOK by Bob Speca 1979, ISBN 0-446-97046-8 is
a history of the guy who did this stuff on telvision shows for a few
years to get it the world records and raise money for charity

DOMINOES -67 GAMES & TRCIKS by Malcolm A. Bryant, 1982, ISBN
0-8306-1308-0 has a lot of details for arrangements based onthe ratios
of the tiles.

There was also a piece in Scientific American on this subject by Jeral
Walker.

 Quote: From http://www.cincinnati.com/freetime/strange/091602_strange.html and the "Strange but True" column:

Q. When dominoes are set up in a row and then toppled in chain
reaction, how fast does the wave move? How big can the last domino be,
felled by the small initial push?

A: University students in the Netherlands toppled 1.4 million dominos,
says Robert Banks in "Towing Icebergs, Falling Dominoes, & Other
Adventures in Applied Math." Had these all been arranged in a single
row, and spaced maybe 2 cm apart, totaling 28 km, wave speed would have
been around 3 km/hr during the approximately 10 hours of toppling time.

Now take this setup one better by introducing a multiplier factor,
where each successive domino is, say, 1.414 times larger than the
preceding domino, details Jearl Walker in "Scientific American." Walker
(crediting Lorne A. Whitehead) started with an acrylic domino so small
he "could hardly stand it upright," then progressed until the 13th
domino was so heavy he had "difficulty lifting it into place." Still,
the chain reaction initiated by the tiny first domino dropped the end
one, which was 64 times higher and 262,144 times heavier, and with
potential energy almost 17 million times greater!

Make the chain even longer and the sky might be the limit, with
end-line dominoes hardly moveable by mortal men.

The hardcore math is at:

http://www.lorentz.leidenuniv.nl/~jmjvanl/domino.pdf

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