John Schmidt's 626

Cue ball spin reverses (maybe as the speed across felt slowed). From contact with pack to spot, the cue ball is spinning clockwise. After the spot, the spin changes to counterclockwise. You can see it reverse.
 
a few inches past the spot

Biloxi Boy said:
Cue ball spin reverses (maybe as the speed across felt slowed). From contact with pack to spot, the cue ball is spinning clockwise. After the spot, the spin changes to counterclockwise. You can see it reverse.
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I thought it was probably an optical delusion!(JK) It does appear to reverse spin. I watched how he hit the cue ball but of course can't see collisions with other balls.

Did the cue ball really swap directions or was that an illusion caused by the changes in spin speed and the frames per second of the camera?

The only thing I have seen curve this much would be one of the weighted gaff cue balls. Surely a cue ball that out of balance would have shown up before this?

If there had been other indications of a ball or table out of whack that bad I'd say the run was bogus but I'm left stumped by something so ridiculous happening once. Years ago I tried to estimate how many shots I have taken on a pool table. Seemed like I was pretty safely HAMBx2! That weighted cue ball and an old bar table ball that broke a whole side off of it were the only ones that acted that crazy!

Perhaps there were earthquake tremors too small for us to notice? Speaking of Tremors, maybe a gravoid passed under the pool hall at that exact time!

I got no answers, especially after Bob tried to duplicate the shot and couldn't.

Hu
 
The_JV said:
... On the outcome of the shot... Nothing other worldly going on there. Ball went right where he put it.
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In the same sense that the Chicxulub asteroid went right where the dinosaurs put it.:p

Bob <-- you wouldn't believe the mess that made in the living room
 
Biloxi Boy said:
Cue ball spin reverses (maybe as the speed across felt slowed). From contact with pack to spot, the cue ball is spinning clockwise. After the spot, the spin changes to counterclockwise. You can see it reverse.
Click to expand...

I'm not sure that's what happened. Maybe the Wagon Wheel effect?
 
Biloxi Boy said:
Cue ball spin reverses (maybe as the speed across felt slowed). From contact with pack to spot, the cue ball is spinning clockwise. After the spot, the spin changes to counterclockwise. You can see it reverse.
Click to expand...

The curving ball in the video did not reverse spin. It started with right side spin, which was helping or outside spin for that break shot, and continued to spin like a top with right side spin all the way to the pocket. It may have looked different from the stroboscopic effect in the video.

I have never seen a ball reverse its side spin in open table. I think it's impossible.
 
I have to wonder if this controversy will ever be settled.
 
Bob Jewett said:
The curving ball in the video did not reverse spin. It started with right side spin, which was helping or outside spin for that break shot, and continued to spin like a top with right side spin all the way to the pocket. It may have looked different from the stroboscopic effect in the video.

I have never seen a ball reverse its side spin in open table. I think it's impossible.
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I would agree with your best guess that it was a protruding spot on the measle cue ball that caused it. Do you know, was that cue ball carefully inspected immediately after that shot or after that session?
 
Biloxi Boy said:
Cue ball spin reverses (maybe as the speed across felt slowed). From contact with pack to spot, the cue ball is spinning clockwise. After the spot, the spin changes to counterclockwise. You can see it reverse.
Click to expand...
Judging by where he hit the CB (pic below is the moment of contact), it has counterclockwise spin on it the whole way - it only looks like clockwise spin at first.

pj
chgo

js.jpg
 
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Biloxi Boy said:
Cue ball spin reverses (maybe as the speed across felt slowed). From contact with pack to spot, the cue ball is spinning clockwise. After the spot, the spin changes to counterclockwise. You can see it reverse.
Click to expand...

Without some obvious outside force acting on the cueball (which there is none here), how would this even be possible?
 
The table was not level. Horizontal spin on the cue ball does not make it curve like that.

All the best,
WW
 
WildWing said:
The table was not level. Horizontal spin on the cue ball does not make it curve like that.

All the best,
WW
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This was at the end of a 400-ball run. Any unlevelness that bad would have been noticed earlier. I was on the table not long after and the table did not roll off even for very slow shots.
 
Weird theory on the crazy angle that cue ball took:

John did not uniformly clean the cue ball like a player normally does. Instead, he removed the cue ball and basically wiped it with his "greasy" thumb. Could he have unknowingly doctored the cue ball causing it to spin strangely on this scratch?

Probably not. Lol
 
Optical or physical, I see something and the cue ball's path of travel is altered at just about the point the spin "reverse" is observed. I am okay when it comes to reading and writng, but math beyond that necessary for carpentry is not me. Some of you cats with a background in physics need to step up here.

I have seen (and I am sure ya'll have, too) that a skidding ball retards the effect of spin, but when the ball slows and quits skidding, and the ball can "bite" the felt, then the spin becomes effective. Is there any other thing that will "delay" the effect of spin?
 
Bob Jewett said:
This was at the end of a 400-ball run. Any unlevelness that bad would have been noticed earlier. I was on the table not long after and the table did not roll off even for very slow shots.
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So you are convinced beyond a doubt that the spin on the cue ball made it curve like that? If so, maybe you could demonstrate that on a level table. I haven't seen horizonal spin on a cue ball do that.
 
WildWing said:
So you are convinced beyond a doubt that the spin on the cue ball made it curve like that? If so, maybe you could demonstrate that on a level table. I haven't seen horizonal spin on a cue ball do that.
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He said he thought the ball might be spinning on one of the measle spots which was not smooth. Post #272.
 
Bob Jewett said:
My hypothesis is that the cue ball was spinning on one of the spots and that spot was not smooth.
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Looks that way to me too, and judging by the CB's spots visible in the video it is spinning about a small spot at its base where another measle would be.

Reminds me of Mike Page's great description of a ball rolling with side spin - "like a tilted barrel rolling on its rim". In this case the barrel is narrow, close to the width of a spot on the CB, and only slightly tilted, close to vertical.

pj
chgo
 
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So now we are hypothesizing that the red circles on the measle ball are a different compound from the rest of the cue ball? Anyone have confirmation from Aramith on that?
 
WildWing said:
So now we are hypothesizing that the red circles on the measle ball are a different compound from the rest of the cue ball? Anyone have confirmation from Aramith on that?
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I hypothesize that it has to be something on the ball within the small circle that spins/rolls on the cloth. Chalk or a ball deformity come to mind - and it does appear that there could be a measle at the spinning CB's base. Ipso calypso...

pj
chgo
 
Patrick Johnson said:
I hypothesize that it has to be something on the ball within the small circle that spins/rolls on the cloth. Chalk or a ball deformity come to mind - and it does appear that there could be a measle at the spinning CB's base. Ipso calypso...

pj
chgo
Click to expand...

Again, confirmation from Aramith that the red circle would have caused that, being a different compound?
 
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