Summary: David Alciatore, PhD ("Dr. Dave") ILLUSTRATED PRINCIPLES
"Coriolis was brilliant ... but he didn't have a high-speed camera ≠
Part V: massť shot aiming"
Note: Supporting narrated video (NV) demonstrations, high-speed video (HSV) clips, and
technical proofs (TP), and all of my past articles, can be accessed and viewed online at
billiards.colostate.edu. The reference numbers used in the article help you locate the
resources on the website. If you have a slow or inconvenient Internet connection, you
might want to view the resources from a CD-ROM or DVD. Details can be found online
This is the fifth article in a series I am writing about the pool physics book written in 1835 by
the famous mathematician and physicists Coriolis. Three months ago, I described some high-
speed camera work I've done and showed some examples that relate to some of Coriolis'
conclusions. In the last two months, I presented principles dealing with the shape of the cue
ball's path after hitting an object ball, the effect of spin and speed on the shape of the path, and
how to achieve maximum English. FYI, all of my past articles can be viewed on my website in the
instructional articles section.
This month, I look at the system Coriolis developed for aiming massť shots (e.g., see NV
7.11 and NV 7.12). Principle 25 summarizes Coriolis' system, which helps you visualize the final
direction (angle) of the cue ball path based on the aim point on the table surface. Diagram 1
illustrates how the system is applied. The final direction of the cue ball path is along line RA,