This augmented, new edition adds discussion of the bats vertical sweetness gradient, eye-hand cross-dominance, models for the swing of a bat, and accuracy of simulations. The book retains its description of dynamic collisions between baseballs, softballs, and bats, and the intricate modeling of these interactions, using only basic math and physical principles. Veteran baseball science author Terry Bahill explains models for the speed and spin of balls and bats and calculations for bat-ball collisions at a level accessible to most students of the science of baseball. Demystifying the most important factors for understanding bat performancebat weight, moment of inertia, the coefficient of restitution, and characteristics of humans swinging the batsDr. Bahill also explains physical aspects of the optimal bat and the sweet spot. Praise for the First Edition Dr. Bahills book is the perfect tool for teaching how to solve some of baseballs basic science problems. Using only simple Newtonian principles and the conservation laws, Dr. Bahill explains how to model bat-ball collisions. Also, he derives equations governing the flight of the ball, and proceeds to show what factors affect air density and how this density affects the balls flight. And as a unique addition to his fine book, he provides advice for selecting the optimal bata surprising bonus! Dave Baldwin, PhD Major League pitcher, 1966-1973, lifetime Major League ERA, 3.08 If I were the General Manger of a baseball team, I would tell my people to write a ten-page paper describing what this book contains that could improve our performance. I think the book provides the foundation for change. Bruce Gissing Executive VP-Operations (retired) Boeing Commercial Airplanes [I] had a chance to read your research, and I fully agree with your findings. Baseball Legend Ted Williams, in a 1984 letter to the author.