The Core Principles of the Full Swing: Understanding the Golf Swing Through Physics

The goal of a golf swing is not to hit the ball with the greatest possible effort. It is to deliver the clubhead to impact with enough speed, an effective direction of travel and the right clubface conditions, using motion that is as simple and coordinated as possible.

Setup, body rotation, the backswing, transition, downswing, lag and release all serve the same larger purpose:

Create motion efficiently, coordinate that motion, and control the ball’s flight.

Physics gives us a way to think about that purpose. You do not need to calculate your swing. You do need to understand what your movements are meant to accomplish.

Force

F = ma

For constant mass, net force equals mass times acceleration. Force is a vector: it has both magnitude and direction.

In the swing, applying force matters because it changes the club’s motion. The question is not simply how much force you can produce, but whether its direction and timing help create the clubhead speed and delivery you need.

Two swings can feel equally powerful and produce very different results. Effort is a sensation; the club’s motion is the outcome.

Kinetic Energy

Ek = 1/2 mv²

Kinetic energy is a scalar; it does not carry directional information. In this equation, v is speed, and speed is squared.

Increase clubhead speed by 10%, keeping mass and other factors unchanged, and translational kinetic energy becomes 1.1² = 1.21 times its original value—an increase of approximately 21%.

That helps explain why speed matters. It does not mean the ball will travel 21% farther. A faster clubhead still needs suitable face orientation, path, strike location and impact conditions. OpenStax explains the underlying kinetic-energy relationship.

Momentum

p = mv

Momentum is mass multiplied by velocity. It is a vector, pointing in the same direction as the velocity.

It should not be defined as a tendency to keep moving; that wording confuses momentum with inertia. Momentum is useful when describing changes in motion during impact, but clubhead momentum alone cannot specify the ball’s flight. See the definition of linear momentum.

Impulse

J = ∫F dt = Δp

Impulse connects force with a change in momentum. It is the accumulated effect of net force over a time interval. During the brief club–ball collision, the force on the ball changes throughout contact; the resulting impulse changes the ball’s momentum. See the impulse–momentum relationship.

A useful teaching sequence is:

Force → Acceleration → Clubhead Speed → Impact / Impulse → Change in Ball Momentum

This is a conceptual chain, not a complete ball-flight model. The shot also depends on:

• Ball speed.
• Launch direction and launch angle.
• Spin rate.
• Spin axis.
• Aerodynamic effects, including drag, lift and wind.

We need both motion and control of the conditions at impact.

Clubhead Speed

Taken together, p = mv and Ek = 1/2 mv² show that, for a given clubhead mass, increasing speed increases both the magnitude of momentum and kinetic energy.

The practical question is how to create that speed. Trying harder does not automatically make the clubhead move faster. Pulling aggressively with the arms too early, disrupting the relationship between body and arms, or losing sequence can add effort without adding useful speed.

My priority is motion that flows from one part of the swing to the next, building speed at the right time while preserving control of the path and clubface.

Angular Velocity & Tangential Velocity

v = ωr

In a simple circular-motion model, tangential speed equals angular velocity multiplied by radius. At the same angular velocity, a larger radius gives a greater tangential speed. OpenStax describes this model relationship.

A real golf swing is not a circle around one fixed mechanical axis. It is a three-dimensional, multi-segment movement with changing centers of rotation. C7, the seventh cervical vertebra, should not be treated as a fixed pivot for the entire swing.

The equation is useful for understanding a relationship. It does not tell us to lock an axis in place or simply reach farther with the arms. A model supports observation; it does not replace it.

Kinetic Chain

Ground → Legs → Pelvis → Torso → Arms → Hands → Club

This sequence helps us picture how the whole body works with the club. It is not a set of isolated steps in which one part must stop before the next starts. Movements overlap. The key is sequence, together with coordination and timing.

Core, hip, gluteal and trunk musculature contribute to stability, rotation and coordination. The legs, shoulders, arms and other muscle groups also participate. No small group of muscles produces the whole swing, and more arm strength alone does not create an efficient delivery.

Individual coordination matters. Research on pelvis–thorax coupling supports looking at the golfer’s own movement relationships rather than assuming everyone should reproduce one fixed pattern.

Lag & Release

Lag is part of, and can result from, an efficient movement sequence. It is not a wrist angle to freeze in place.

I do not teach golfers to hold the wrist angle for as long as possible and then suddenly throw the club. Dividing the swing into “hold” and “throw” can make release timing and clubface control more difficult.

The important questions are how the body, arms, hands and club work together, and when the release develops. We want the club to gain speed through coordinated motion, rather than chase a still photograph of an impressive lag position.

Double Pendulum — Understanding Lag & Release

The double-pendulum model provides a useful way to visualize how proper sequencing and release timing can contribute to high clubhead speed.

It is a simplified model. A real golf swing is a much more complex three-dimensional, multi-segment movement. The model does not ask you to move your body like two rigid pendulum arms.

Watch on the GolferGo / 高格会 YouTube channel ↗

Backswing & Downswing: Build the Next Movement

In my teaching approach for a right-handed golfer, I prefer to organize the backswing through right-side hip movement, then use pelvic and left-side movement to help establish the transition and downswing sequence.

This is Hauwson’s teaching model, not a universal law of golf biomechanics. Its application needs to reflect the individual golfer and the results of the movement.

A well-organized backswing is an important condition for a stable downswing.

That does not mean every backswing must look identical. It means the backswing should set up what follows. Unnecessary lifting, swaying or other extra motion often calls for compensation later, increasing the complexity of timing, swing path and clubface control.

Judge the backswing by how it connects to transition, downswing and impact—not only by its appearance.

Impact: The Result We Organize the Swing Around

Impact is the outcome toward which the preceding movements are organized. When assessing a shot, I consider:

• Clubhead speed.
• Club path at impact.
• Clubface orientation at impact.
• Angle of attack: whether the clubhead is traveling upward or downward into contact.
• Strike location on the face.
• Dynamic loft: the loft actually delivered at impact.

These factors interact to influence ball speed, launch and spin. A single static position cannot explain the entire shot.

Swing positions are not goals in themselves. Each movement should create useful conditions for the next, ultimately supporting impact. A position that looks good but demands extra compensation later deserves another look.

Simple Swing — Hauwson’s Teaching Philosophy

The most effective swing is often the simplest swing.

Simple does not mean effortless to learn, and it does not mean everyone needs the same motion. It means removing movements that do not help, so the useful movements connect more cleanly.

Unnecessary motion can reduce efficiency and make timing, swing path and clubface control more complicated. Practice is not only about adding technical instructions. It is also about recognizing what can be removed.

Simple is not the same as easy. A simple swing is the result of removing unnecessary motion.

简洁并不等于简单。 好的挥杆，是不断去掉那些不必要的动作。

That is the foundation of my approach: understand the goal, establish the sequence, reduce interference, and build a motion you can repeat.

Setup — Before the Swing Begins

Chapter 00 provides the conceptual foundation for this Full Swing series. The first actual swing stage is setup.

Grip, posture, stance, alignment and ball position establish your starting conditions. Before the club moves, those conditions already influence the movements available to you.

Build a useful starting point first. Then we can explore the takeaway, rotation and release.

01 · Setup — Read the original teaching notes (Chinese, with English terminology) →