The same way a cue's speed does - by determining the amount of energy delivered by the moving cue....all else being equal, how does a cue's weight affect the draw action of a cueball?
If you want the physics and math, it is here:
TP A.30 – The effects of cue tip offset, cue weight, and cue speed on cue ball speed and spin
TP B.8 – Draw shot physics
They covers how everything affects draw, including cue weight.
Enjoy,
Dave
Where gravity is constant, weight = mass.
Kinetic energy = mass/2 x velocity^2.
Mass/weight is one of the two factors in the equation for how much energy the moving cue delivers.
pj
chgo
The same way a cue's speed does - by determining the amount of energy delivered by the moving cue.
Kinetic energy = mass/2 x velocity^2.
Mass (= weight in constant gravity) and speed are the only two factors in the equation.
pj
chgo
Where gravity is constant, weight and mass express the same value (in different terms) - so they're equal in their relevance to the kinetic energy equation. But mass is independent of variable gravity, so it's the preferred term.Yo, Patrick...weight is never equal to mass amigo. I had a feeling u was a pretender.
Where gravity is constant, weight and mass express the same value (in different terms) - so they're equal in their relevance to the kinetic energy equation. But mass is independent of variable gravity, so it's the preferred term.
We're both pretenders among actual scientists like Dave.
pj
chgo
In the meantime, what's the answer, Doc ? Heavy or light cue gives better draw
Therefore, with a typical collision efficiency, the offset that produces the most spin is
close to the miscue limit (0.5). Note that, for the assumptions above, a lighter cue (with
a larger mass ratio mr
), will deliver slightly more spin to the cue ball than a heavier cue for
offsets close to the miscue limit (x/R = 0.5), but this probably isn't enough of a reason to
try to switch to a lighter cue stick. The only other way to increase the amount of spin,
other than by increasing the tip offset (up to the miscue limit), is to increase the stick
speed.
You can calculate weight from gravitational force and mass (W=mg), so if the gravitational force doesn't change, its weight indicates its mass (W/g=m).what if gravity is constantly equal to 2 ?? are weight and mass the same "value"
I'm close to giving up on explaining this to you.Give up, Patrick.
You can calculate weight from gravitational force and mass (W=mg), so if the gravitational force doesn't change, its weight indicates its mass (W/g=m).
I'm close to giving up on explaining this to you.
pj
chgo
Right. Grams aren't "equal" to ounces either.so, the weight INDICATES mass....the weight is not EQUAL TO the mass...amirite?
Congratulations. You win the trophy for Most Pedantic.I win. you lose. haha
The answer is not simple. I think the short answer is: It really doesn't matter very much.Thanks, Doc, I'll check it out right now...but it may take me a while to get through the derivations.If you want the physics and math, it is here:
TP A.30 – The effects of cue tip offset, cue weight, and cue speed on cue ball speed and spin
TP B.8 – Draw shot physics
They covers how everything affects draw, including cue weight.
In the meantime, what's the answer, Doc ? Heavy or light cue gives better draw?
Anybody ever try a super light cue made from something like bamboo?
so, the weight INDICATES mass....the weight is not EQUAL TO the mass...amirite?
I win. you lose. haha
The answer is not simple. I think the short answer is: It really doesn't matter very much.
FYI, I just created the following resource page to try to provide a longer answer:
Check it out.
I will continue to improve this page as I answer any remaining questions in this thread.
Regards,
Dave
Based on all of the info and links on the draw shot cue weight effects resource page, here is a better answer than I offered earlier:Physics question:
Let's say an example, on a draw shot.
We have the same player, with the same exact stroke every single time, shooting one time with 19oz cue, then another time with the exact same cue but reduced to 17oz.
Let's assume he shot the same shot with both, and also same emotion, backstroke, everything to the teeth, also he hit down on the cueball on the same exact point.
Now my question is, with which cue does the cueball travel further to the back?
Based on all of the info and links on the draw shot cue weight effects resource page, here is a better answer than I offered earlier:
If the tip contact point is very close to the miscue limit and the OB is not very far from the CB, the lighter cue could do slightly better (everything else being equal, including cue speed).
But if the OB is not very close to the CB, the heavier cue would definitely result in more draw (everything else being equal, including cue speed).
But assuming the cue speeds are the same with each cue might not be a realistic assumption, especially for a power draw shot, where muscle physiology differences come into play, per the info on the optimal cue weight resource page.
Regards,
Dave
You probably have slow-twitch muscle fibers (e.g., like a typical white guy that can't jump high or sprint fast), so that would make sense that you do better with the heavier cue.Thanks for the answer, although not satisfied, it boggles my mind why there are all these variables within this simple question.Based on all of the info and links on the draw shot cue weight effects resource page, here is a better answer than I offered earlier:
If the tip contact point is very close to the miscue limit and the OB is not very far from the CB, the lighter cue could do slightly better (everything else being equal, including cue speed).
But if the OB is not very close to the CB, the heavier cue would definitely result in more draw (everything else being equal, including cue speed).
But assuming the cue speeds are the same with each cue might not be a realistic assumption, especially for a power draw shot, where muscle physiology differences come into play, per the info on the optimal cue weight resource page.
i.e. If CB is close to OB then xx, if CB is away from OB then yy, if tip is hard then XX, if tip is soft then yy, if power draw shot then Z.
I mean for the love of god why isn't the answer simple, I said all variables are the same.
So Dr Dave, with power draw shots the likes of which Larry Naval used to do, which cue should outperform the other? please just a straight answer
Also, I have been experimenting myself with the same exact cue and shaft, one is 17oz, the other is 19oz, and I feel that the 19oz is giving me more spin into shots, draw shots included, even my friend told me that I am drawing further than I want every single time using the 19oz as opposed to the 17oz.
So without using Math and based on real experience, I feel that 19oz is drawing the cueball much further than the 17oz from just two days of play, but I leave the math and physics to you guys.