That's a great idea!
By the way, I just found this .pdf where a guy from Argonne National Laboratory explained the cue ball direction with friction as I did (please see p.19).
ftp://ftp.tcg.anl.gov/pub/shepard/pool/old_versions/physics.PDF
But, a model is just a model. Nobody has done your...
Wow. I don't know how you can core it out, but it's going to be great to see if you are right and the ball goes straight when hit by the light ball!
Just some quick comments:
In your last video, the impact point was a bit unclear, but it seems that the ball did not go parallel to the cue...
Did you make the tip from a cue ball?? So cool!
It's hard to tell, but it looks like the ball goes to the normal direction rather than parallel to the cue direction... What do you think?
I have a break cue with a phenolic tip, so I could also try some experiments when I have a chance. Though I...
Thank you for your answer. My thought is that as long as we don't miscue, there is enough friction between the tip and ball due to chalk.
But, I have never tried English with a phenolic tip without chalk. If we can make the ball go straight without miscue, it might not be friction because now...
We all know that. Please read the thread first...
My question was why the ball goes more straight in cue-to-ball collision than the ball-to-ball collision.
And my answer is the friction between the cue tip and cue ball makes the cue ball go almost straight (parallel to the cue direction)...
It is so weird that these billiard lovers do not give a straight answer to my original question. These links are of some help, but I could not find an answer probably because my question is too basic.
But, I think I got a simple answer in this thread:
It is *friction* between the cue tip and...
You are right. I cannot know the contact time and slippage from my 240fps video.
If I shoot a ball several times (<10-20) without putting additional chalk, the cue readily slips on the ball (miscue) if my shot is off center. This is because a significant amount of chalk is removed from the cue...
Yeah, this might be possible. Even if the cue tip is the same as a usual cue (so the friction coefficient should be the same in the simplest case), there may be nonlinearity of friction coefficient as a function of amount of force. If the force applied by the metal cue is too strong due to the...
I agree that these are necessary experiments to know the actual force applied by the cue. But, I am now satisfied by the simple model because in the model the ball always goes straight.
I think I am done here if no one points to a flaw in the logic. Thank you.
This video is still mysterious, though... maybe some unidentified leftwards force makes the ball go significantly off from parallel to the cue direction, but I will think about this in other occasions.
You are absolutely right.. but this is a kind of tautology. When I was asking about applied force F by the cue, I was talking about a simple case in theory where some unknown parameters can be ignored.
When force F (whose direction is off the normal) is applied to a ball, is the tangential...
Some players including professional players use that kind of shots when they have to hit with right/left English. I think it is not like stroking or scratching on the ball, but rather an attempt not to push against the impact of cue-to-ball collision, which results in a sudden change of the cue...
I think I got what you said. I meant that the directions of the cue and F are the same, but you meant that the direction of F is the direction of the ball acceleration and not necessarily the cue direction. I think you are right... anyway, it seems that you don't think that the ball always goes...