Velocity of Cue Ball: Instant vs. Impact on Pool Table Debate

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Discussion Overview

The discussion centers around the velocity of a cue ball during a break shot in pool, specifically whether the greatest velocity occurs at the moment it leaves the cue stick or at the moment it impacts the other balls. Participants explore the implications of cue ball placement and the relationship between distance, power, and control in delivering a shot.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • Some participants argue that the cue ball is never faster than the instant it comes off the cue stick.
  • Others contend that the cue ball accelerates after leaving the cue stick until it hits the other balls.
  • One participant states that once the cue is no longer in contact with the ball, it no longer imparts force, thus the ball cannot accelerate and only decelerates due to friction.
  • Another participant suggests that the placement of the cue ball affects the ability to deliver power and control, indicating a trade-off based on distance from the balls.
  • There is a discussion about the impact of stance and positioning on the ability to deliver power versus control, with some suggesting that being closer to the balls allows for better control, while others argue that it may limit power.

Areas of Agreement / Disagreement

Participants express differing views on the maximum velocity of the cue ball and the effects of cue ball placement on power and control. No consensus is reached regarding the correct argument about the cue ball's velocity or the optimal placement for a break shot.

Contextual Notes

Participants do not fully explore the assumptions behind their claims regarding acceleration, force, and the physics of the break shot, leaving some aspects of the discussion unresolved.

syano
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On The Pool Table ...

At the break where is the greatest velocity of the cue ball? At the instant it comes off the stick or the moment it hits the balls?

The question here is is it better to shoot the cue ball at the line or to pull the cue ball back and increase the distance to the balls?

One argument is that the ball is never faster than the instant it comes off the cue. The other argument is that the ball is accelerating once it comes off the cue stick and that the velocity increases until it hits the balls.

Which argument is correct?
 
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Once the cue is no longer in contact with the ball, it longer imparts a force on it. Without a force, the ball cannot accelerate. The ball just decelerates due to the friction of the felt.

The logic in choosing where you want to place the cue for a break has nothing to do with this question, though. You want to place it where you can hold the cue in such a way to deliver the most power with the most control -- it's a trade-off. Generally, the further into the table, the less power you'll be able to deliver, and the closer to the edge, the less control you'll have.

- Warren
 
We can hit the ball with the same amount of the control whether it is at the line or against the rail.

Thanks for the reply chroot... You mentioned, "the further into the table, the less power you'll be able to deliver." I don't understand. It seems to me the closer you are, to the balls you are about to hit with the cue ball, the more power you will be able to deliver. And the further away you are the less power you will deliver.

Where am I off?
 
Depends on your strike --- topspin might give a little "acceleration" (conversion of spin energy to translation along the table), but the energy of the strike (translational plus whatever spin) is from the cue stroke.
 
syano said:
.

Thanks for the reply chroot... You mentioned, "the further into the table, the less power you'll be able to deliver." I don't understand. It seems to me the closer you are, to the balls you are about to hit with the cue ball, the more power you will be able to deliver. And the further away you are the less power you will deliver.

Where am I off?

The difference is largely in your stance. The farther the ball is from the edge, the more you must stretch out of position to make your stroke. It is much the same as with determining where to place your guide hand (the one the cue stick slides through); closer to the ball gives you beter controll, further away allows more power.
 

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