The two would miss the side pocket to the right and hit the side rail about 2-4" to the right of the side pocket. Meaning, your tangent line does not look correct to me, which means the CB would not travel the path you drew.
Breakdown of Earl Strickland Shot
- Thread starter BeiberLvr
- Start date
The two would miss the side pocket to the right and hit the side rail about 2-4" to the right of the side pocket. Meaning, your tangent line does not look correct to me, which means the CB would not travel the path you drew.
more like the factors involved
Energy never goes away but it is converted into forms of energy that people rarely consider including the heat and sound you mentioned.
One question I always have about pool balls, I know they flex on impact but how much do they flex? I have seen this mentioned but I have never seen it quantified. I have made caroms where I had to shoot hard enough to have a sliding cue ball then the object ball came off the other ball and went about five feet into the pocket. I have never seen these shots vary noticeably from what two perfectly round objects that didn't flex would create so I have to assume ball flex is a nonissue although I have seen it claimed that the main sound we hear when balls collide violently is the phenolic snapping back.
DIIK! It is interesting to puzzle over these things on the Net but then some pool hall bum that thoroughly understands how and is clueless about why will beat me like a rented mule!
Hu
Energy never goes away but it is converted into forms of energy that people rarely consider including the heat and sound you mentioned.
One question I always have about pool balls, I know they flex on impact but how much do they flex? I have seen this mentioned but I have never seen it quantified. I have made caroms where I had to shoot hard enough to have a sliding cue ball then the object ball came off the other ball and went about five feet into the pocket. I have never seen these shots vary noticeably from what two perfectly round objects that didn't flex would create so I have to assume ball flex is a nonissue although I have seen it claimed that the main sound we hear when balls collide violently is the phenolic snapping back.
DIIK! It is interesting to puzzle over these things on the Net but then some pool hall bum that thoroughly understands how and is clueless about why will beat me like a rented mule!
Hu
When two balls collide you get flat spots on both balls. If you prepare the contact point properly, you can see the size of the flat spot afterwards. It is about a quarter inch for a fairly firm shot.
A little geometry will give you how much each ball compressed as well as how far forward the cue ball moved while it was in contact with the object ball. The result for each is much less than a millimeter.
You can also calculate the size of the flat spot if you know the contact time of a ball-ball collision. Wayland Marlow did that time measurement (with a fairly simple apparatus consisting of a battery, resistor and capacitor along with wires and a DC voltmeter) and described it in his book "The Physics of Pocket Billiards".
I miss CAD a lot of times.
Bob,
I made my living as a draftsman/designer for awhile, using ACAD from 2.X to 13 and Intergraph PC for a few years. Particularly with Autocad I could draw these things out in less time than it takes to talk about them. Even though it is times two as I assume both balls flex equal amounts the amount a 2.25" ball has to flex to cause a quarter inch flat spot isn't much. Then there is the question of snap back while in contact which might offset this compression somewhat.
One example I think of is a one pocket shot. Two object balls within a few inches of each other on my opponent's side of the table near the side pocket and positioned so there was no bank. Looking, I saw an easy carom if the cue ball was skidding into the object balls. A very firm but not break speed hit with no allowance for anything but the collisions of perfectly round objects centered my pocket. With a pool shot we can never be sure exactly how it was hit but seemingly the things like slight compression and rebound are nonissues.
I always wonder a little about pool balls. Even a cheap set I picked up years ago with very little playing time on them plays much better than house balls even at a quality pool hall. One issue is that the pool balls have gotten mixed over the years so the factory weight matching is gone. I can't help wondering if old balls are as round as new ones or if all of the hits have affected their roundness. As always, more questions than answers!
Hu
Bob,
I made my living as a draftsman/designer for awhile, using ACAD from 2.X to 13 and Intergraph PC for a few years. Particularly with Autocad I could draw these things out in less time than it takes to talk about them. Even though it is times two as I assume both balls flex equal amounts the amount a 2.25" ball has to flex to cause a quarter inch flat spot isn't much. Then there is the question of snap back while in contact which might offset this compression somewhat.
One example I think of is a one pocket shot. Two object balls within a few inches of each other on my opponent's side of the table near the side pocket and positioned so there was no bank. Looking, I saw an easy carom if the cue ball was skidding into the object balls. A very firm but not break speed hit with no allowance for anything but the collisions of perfectly round objects centered my pocket. With a pool shot we can never be sure exactly how it was hit but seemingly the things like slight compression and rebound are nonissues.
I always wonder a little about pool balls. Even a cheap set I picked up years ago with very little playing time on them plays much better than house balls even at a quality pool hall. One issue is that the pool balls have gotten mixed over the years so the factory weight matching is gone. I can't help wondering if old balls are as round as new ones or if all of the hits have affected their roundness. As always, more questions than answers!
Hu