Michael Jacobs' new book:
Jacobs 3D is the first golf pro commissioned software to measure the forces that go into hitting a golf ball. It is expanding our understanding of exactly what, how, and when the most important elements of the swing happen. Instead of “waiting” to see kinematic results, Jacobs 3D is giving us a look at what is happening earlier in the chain of events. Having access to this information will transform how teachers and researchers study the golf swing—and provide a much clearer, quicker path for the average player to improve. I’m using it to develop new curriculum for the Jacobs 3D Initiative, and to research the real “causes” of a swing. It’s an exciting time to be studying the golf swing!
Over the past 20 years, Mechanical Engineer Dr Steven Nesbit has conducted the most influential research in the history of our sport. As a researcher for the USGA he conducted research on equipment, the actions that the golfer applies to the club during a swing and a full biomechanics study on the human body during a golf swing. His research has shaped the rules of the game and the understanding of how the golfer moves their club and body in a swing. After his work with the USGA, he went on to study other sports like baseball and tennis.
Other than a few ‘student interest’ research papers his work was dormant in the published papers and unpublished studies at the USGA. In 2010, I met Dr Steven Nesbit and we discussed and studied his prior research and he was very intrigued to see a dedicated golf pro applying the findings and conclusions of his studies. I was experiencing unparalleled success learning and applying the physics of the golf swing and the biomechanics of the human body. Steve’s interest in golf research was reinvigorated in 2014 when we decided to launch a new layer of research together with the commission of the Jacobs 3D golf swing analysis software.
Our new software platform Jacobs 3D, evaluates both the kinematics and kinetics of the golfer. You can break a golf swing down into those 2 categories BUT the kinetics category had never been attempted before by a golf teacher.
- Kinematics describe the movements of a golf swing (speed, velocity, acceleration, rotation, etc)
- Kinetics are the forces that created the movement (forces, torques)
Traditional software packages are great at measuring kinematics (movement) but they don’t show the kinetics, or forces at play. For example, I could already see kinematically the motion of the club twisting on the downswing as the player squared the face. I could see that it twisted, and how fast it was twisting, but I wanted to know how much force/torque it took the player to twist it, and when in the swing that twisting effort started to happen. The ability to do that wasn’t out there, so I decided to solve the problem myself. I built my own software—Jacobs 3D.
Force = Mass X Acceleration Torque = Inertia X Angular Acceleration
One of the Fundamental Elements of the golf swing is the force that the golfer applies to the grip when they move the club throughout the motion. In the Fundamental Book, we discussed and displayed many examples of the sum of the forces applied to the grip from the golfer. This ‘linear’ force is continually changing directions as it moves around in a curved path.
The force, which is the predominate action supplied by the golfer, is categorized as the ‘linear’ component of the swing. The sum of the forces can be broken down into components. In our convention of analysis, we have several different coordinate systems to analyze the components of the linear force. The Master Elements cover those components.
The force applied to the grip also plays a big role in how the club rotates during a golf swing. The rotation of the club, ‘angular component’ of the swing, is directly effected by the direction of the force that the golfer applies. How the club rotationally responds to the force you apply, will directly effect your options for applying torque to the club.
Your applied torque is also effected by the rotational resistance of the club at each instant in time. The rotational inertia of the club is very interesting and requires tracking what point the club is rotating around and how that changes throughout the swing. Inertia about this point is a true indicator of what the golfer actually experienced. All of these items wrapped together are the ‘truths’ of the golf swing.
In the Fundamental Book, we broke the rotation of the club down into 3 components: Alpha, Beta, Gamma. We also described and displayed how several golfers were applying their torque to the grip point to influence the angular movement of the club.
The Kinetics just described are what create the kinematics.
Elements of the Swing
The first book – Elements of the Swing Fundamental Edition – explained and illustrated the essentials of golf club kinetics. This book was the first ever book written by a golf pro that illustrated a golfer’s force and torque application to a golf club. With over 100 images and over 40 samples, the Fundamental Edition has become a staple in the library of all golf swing enthusiasts.
Instant Ebook version in our website shop for $20
Hard copy book is on Amazon for $34.99
Along with kinetics, Jacobs 3D includes over 100 kinematic parameters which display the golf swing as never seen before. Planes of motion, center of curvatures, velocities, accelerations, timing, and pathways are just some of the descriptions that we use . As I organized all of these parameters, I categorized them in to Fundamental and Master categories. The Jacobs 3D Club Analysis is a grand total of150 items. Highlighted below are 4 Figures from the analysis that are a common talking point.
The Fundamental book introduced the Hub Path, the rotation of the club into Alpha Beta and Gamma components, the force applied to the grip by the golfer, resistances, work, energy, power and a whole lot more.
In addition to the Fundamental book, both Dr Nesbit and myself created a 90 minute video discussing the physics of how the club moves. In the video, Dr Nesbit covers his interesting backstory in golf and how he derived the equations of motion to analyze a golf swing. Michael Jacobs adds in commentary from the golf professional side and discusses what he uses in his teaching to help golfers.
The 90 minute video is available for instant streaming access at the link below: