murk1e writes "The BBC reports that in this article that a smart Pool table has been invented. The full information is here. For more about the Physics of Pool, try this site, or for a game, try here."
Re:The first rule of bar games...
by
Anonymous Coward
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· Score: 1, Informative
You are wrong. He was referring to Minnesota Fats. I own you.
Re:I've seen this before
by
suhit
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· Score: 4, Informative
Well, actually a professor at Columbia University (Dr. Tony Jebara) was just interviewed about his "new device [that] may turn billiards beginners into high-tech pool sharks". The article was at http://www.ny1.com/Living/technology.html. It looks very cool. Also he just bought a pool table for the department to test his stuff on, and given that my office is just a few doors down from his, I will enjoy playing for hours (so much for my PhD).
Re:smart pool table
by
Shanep
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· Score: 4, Informative
All this "laser" business reminds me of an old episode of Quantum Leap.
Lasers are actually not practical for showing pool ball angles after the first bounce (even if the shooter takes imparted cushion spin into account with off centre shooting) due to the fact that the angle reduces after each successive bounce due to spin the cushions impart on the ball.
If you hit a ball hard at a moderate angle, intending to get the ball to bounce back and forth many times between two cushions, you will find that the angle will keep getting closer to 90 degrees to the cushions, until it actually appears that the ball is just bouncing back and forth parallel to the cushions 90 degrees to those being bounced off. Going from a moderate start angle to close to 90 degrees quite quickly.
I don't think photons suffer the imparted effects of cushion spin.
Also, not related to angle, but velocity, is that when a ball is first hit (on centre) it moves across the table surface initially without forward "rolling" spinning. The friction between the ball and table surface actually slows the ball down mostly up to the point where the rolling becomes "in step" with the velocity. When this ball hits a cushion, this rolling speed is slowed dramatically by the sudden braking effect of the ball pushing hard into the cushion and any rolling that remains after the bounce is quickly reversed as the ball now starts rolling in the opposite directing, again due to the friction of the ball against table surface. This in addition to energy being absorbed by the cushion (well, I don't like the term "absorbed" being used to describe energy "loss". The energy is converted to sound and heat) has the overall effect of making a ball travel much less than if it were to be hit with the same force without obstacles.
-- War crimes, torture, lies, illegal spying... Would someone give Bush a blowjob, already, so he can be impeached?
Physics of Pool
by
JewFish
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· Score: 5, Informative
The real physics[PDF] behind pool. This is much more stimulating than the "physics link" posted in the story.
free book on the physics of pool
by
bcrowell
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· Score: 5, Informative
There's a free book on the physics of pool. Reviews here would be appreciated.
Slashdot Mirror
Yeah, but it helps out those saddos who only ever read /.
BTW, the New Scientist article is here
You are wrong. He was referring to Minnesota Fats. I own you.
Well, actually a professor at Columbia University (Dr. Tony Jebara) was just interviewed about his "new device [that] may turn billiards beginners into high-tech pool sharks". The article was at http://www.ny1.com/Living/technology.html. It looks very cool. Also he just bought a pool table for the department to test his stuff on, and given that my office is just a few doors down from his, I will enjoy playing for hours (so much for my PhD).
All this "laser" business reminds me of an old episode of Quantum Leap.
Lasers are actually not practical for showing pool ball angles after the first bounce (even if the shooter takes imparted cushion spin into account with off centre shooting) due to the fact that the angle reduces after each successive bounce due to spin the cushions impart on the ball.
If you hit a ball hard at a moderate angle, intending to get the ball to bounce back and forth many times between two cushions, you will find that the angle will keep getting closer to 90 degrees to the cushions, until it actually appears that the ball is just bouncing back and forth parallel to the cushions 90 degrees to those being bounced off. Going from a moderate start angle to close to 90 degrees quite quickly.
I don't think photons suffer the imparted effects of cushion spin.
Also, not related to angle, but velocity, is that when a ball is first hit (on centre) it moves across the table surface initially without forward "rolling" spinning. The friction between the ball and table surface actually slows the ball down mostly up to the point where the rolling becomes "in step" with the velocity. When this ball hits a cushion, this rolling speed is slowed dramatically by the sudden braking effect of the ball pushing hard into the cushion and any rolling that remains after the bounce is quickly reversed as the ball now starts rolling in the opposite directing, again due to the friction of the ball against table surface. This in addition to energy being absorbed by the cushion (well, I don't like the term "absorbed" being used to describe energy "loss". The energy is converted to sound and heat) has the overall effect of making a ball travel much less than if it were to be hit with the same force without obstacles.
War crimes, torture, lies, illegal spying... Would someone give Bush a blowjob, already, so he can be impeached?
The real physics[PDF] behind pool. This is much more stimulating than the "physics link" posted in the story.
There's a free book on the physics of pool. Reviews here would be appreciated.
Find free books.
Get your Fats straight! Heh.
ah, I believe the lasers are more of a projection onto the table from above.