Re: God damnit Bambu... You too Bob!

On Jan 30, 7:20 pm, "Dan White" <dwhite...@xxxxxxxxxxx> wrote:
"Bambu" <dmanass...@xxxxxxxxxx> wrote in message

news:1d3844a3-562d-437f-a57a-6e5552ad5e3a@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Jan 29, 9:09 pm, sittingduck <d...@xxxxxxxxxxxxxxxxx> wrote:

Bambu wrote:
http://billiards.colostate.edu/normal_videos/new/NVB-7.htm

All that proves is that masse works. There's no way to get a level stroke
and
spin the ball along the horizontal axis.

--http://improve-usenet.org

Jesus H. Christ. What is with you guys and this level cue stuff? Do
you shoot upside down?

reply:
We just keep bringing it up because you haven't shown anybody that you
really understand why it matters.  Maybe it would help the conversation if,
just once, you could pretend that you agree with us, and explain in a few
sentences why a downward hit causes curve, while english does not.  If you
can explain it clearly, then at least we know that you understand where we
are coming from.

What do you say?



If you took the time to read the forum, I wouldnt have to bother
typing this twice. But ok, just for you danny boy.
Its a good point about the downward hit because there is only contact
on a single horizontal plane(parallel to the table) when balls
collide. No doubt, a downward hit will result in much more curve. But
I still think a spinning ball can curve just a bit....even without the
downward hit, and daves video demonstrates that.

Dr. Dave:

When a ball has sidespin only, the ball's spin axis is vertical. When
a ball is rolling, the ball's spin axis is horizontal. When a ball is
rolling with sidespin, the ball's spin axis is somewhere in between
(but in the same vertical plane). As the sidespin wears off, the spin
axis gradually tilts closer and closer to the horizontal direction.

http://billiards.colostate.edu/technical_proofs/new/TP_B-2.pdf

Both the forward roll of the ball and the sidespin are accounted for.
It turns out the spin-down friction torque is fairly constant with
sidespin rate (rpm's), but as the ball travels more slowly, the force
can turn the ball a little more.
.

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