Much of the applied physics of this book is familiar to basic physics students. Tackled players are compared to falling bodies. Collision between players, singularly and with a group of players, is modeled according to conservation of momentum. The angular motion of the leg-foot combination is computed during the kicking process.
The range of the kicked ball is given as v-squared sin2A/g, where v is the speed of the thrown or kicked ball, A is the angle of the trajectory relative to the horizontal, and g is the gravitational constant. Obviously, the kicker is best off kicking the ball as close as possible to 45 degrees, even if sacrificing speed or accuracy. In addition, a doubling of kick speed will quadruple the distance the ball travels.
Some relatively-uncommon physics is applied in this book. For instance, player movements are compared to random walks. Also, the physics of overloaded columns is compared to that of broken bones. Finally, the buildup of body heat in active players, along with dissipation by sweating, is modeled according to the physics of heat.
The author of this book assumes that the reader is familiar with British terms surrounding the game of rugby. As for physics, there is a glossary of physics terms in the back of the book. An extensive bibliography for further reading, on science and sports, is also provided.