Cueball Physics - The Force of the Cueball

Sharivari

Sharivari

AzB Silver Member
Silver Member
Hi AZB,

I just released a video that took me over 40 hours to produce. And because thats a lot of time for a just 12 minute long video I want to share it with as many players as possible.

And of course I want to know what you think of it, how I can improve my videos in general and what I am most interested in. Did you learn something new? I am asking because I don't only want to produce videos that are helpful for beginners, but also for experienced players.

So if you're interested in the cueball behaviour you should give this one a try :)
https://youtu.be/KL0W45AkNMo

Sharivari
 
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Sharivari.. Your YouTube videos are some of the greatest out there.
Not that there aren't other good videos, but yours rank as top notch.

.
 
thank you for all you do to disseminate knowledge
i subscribe to your youtube channel.....:thumbup:
 
The little graphic showing the action of cueball and object ball at the bottom is An especially nice touch as well...
 
Information, graphics, production are top shelf. Thank you for your hard work Sharivari:thumbup:

-Kat,
 
Good job and nicely produced video
Good for someone like me who isn't much good in physics :thumbup:
 
Sharivari said:
Hi AZB,

I just released a video that took me over 40 hours to produce. And because thats a lot of time for a just 12 minute long video I want to share it with as many players as possible.

And of course I want to know what you think of it, how I can improve my videos in general and what I am most interested in. Did you learn something new? I am asking because I don't only want to produce videos that are helpful for beginners, but also for experienced players.

So if you're interested in the cueball behaviour you should give this one a try :)
https://youtu.be/KL0W45AkNMo

Sharivari
Click to expand...


Excellent!
 
Great video and congrats on the sponsorship from aramith and simonis. Hopefully this is just the beginning of a very fulfilling journey for you. I enjoy your work
 
Thanks. Yes I hope so, too. I love this game so much so that the dream obviously would be to do that 24/7 and nothing else than just pool. I think anyone who plays pool can relate to that. Just such an amazing game that never gets boring.
 
As one versed in Physics: you are using the word force improperly. In physics we have

F = M × a

A perfectly well defined definition of what the word "force" means.

The word you want to use is mostly "Spin" but occasionally you want to use the word "energy".
Energy contains both the forward rolling velocity plus the spin component carried by the rolling ball.

For example: a ball rolling at 1 foot/second will travel a certain distance
A ball traveling at 1 foot/second with side spin will travel a much greater distance.
The ball with sidespin has greater energy (in this case through rotational inertia).
 
MitchAlsup said:
As one versed in Physics: you are using the word force improperly. In physics we have

F = M × a

A perfectly well defined definition of what the word "force" means.

The word you want to use is mostly "Spin" but occasionally you want to use the word "energy".
Energy contains both the forward rolling velocity plus the spin component carried by the rolling ball.

For example: a ball rolling at 1 foot/second will travel a certain distance
A ball traveling at 1 foot/second with side spin will travel a much greater distance.
The ball with sidespin has greater energy (in this case through rotational inertia).
Click to expand...

Once the ball leaves the tip, the force acting on the ball is the force the cloth exerts on it from friction. And that is only there when the ball is sliding (not rolling) on the cloth. He is showing that just by noting the direction of that force (cloth on ball), a number of apparently complex motions of the cueball suddenly make sense.
 
MitchAlsup said:
... For example: a ball rolling at 1 foot/second will travel a certain distance.
A ball traveling at 1 foot/second with side spin will travel a much greater distance.
The ball with sidespin has greater energy (in this case through rotational inertia).
Click to expand...
I believe that a ball with lots of sidespin will not go farther for a given initial speed than a ball without sidespin. The exception is if it hits a cushion and thereby translates the sidespin into linear motion. This is not too hard to test.
 
Bob Jewett said:
I believe that a ball with lots of sidespin will not go farther for a given initial speed than a ball without sidespin. The exception is if it hits a cushion and thereby translates the sidespin into linear motion. This is not too hard to test.
Click to expand...

Bob,

Consider that a ball hit with sidespin has energy in 2 directions, 1) the typical forward direction, and 2) the spinning direction.

After a short distance over the cloth, the side spin and the forward roll on the ball converge at the place the CB touches he cloth. The ball has forward roll, and also has side spin, If both the forward roll and the amount of sidespin were equal, at CB contact,
The roll axis on the CB is now at 45º with respect to vertical. The point of contact of the CB with the cloth now circulates from the bottom of the CB to the <say> leftmost side of the CB.

The rotational inertia of a ball rolling at such an angle is greater than the rotational inertia of a ball rolling naturally forward at the same speed but without sidespin.

Thus there is more "energy" in the CB and it will roll farther.
 
mikepage said:
Once the ball leaves the tip, the force acting on the ball is the force the cloth exerts on it from friction.
Click to expand...

Ignoring air resistance;

And that is only there when the ball is sliding (not rolling) on the cloth.
Click to expand...

The forward rolling CB still has friction while rolling on the cloth--just a lot less than before it accumulated natural forward roll.

He is showing that just by noting the direction of that force (cloth on ball), a number of apparently complex motions of the cueball suddenly make sense.
Click to expand...

My only complaint was the misuse of the word "force" in conjunction with the physical explanation. Physics has a strict definition of what a "force" is.

And while the video was both entertaining and well executed, nicely demonstrating the effects. The word "force" is inappropriate in a physics context.
 
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