Lesson 3a: The Magic of Dimples
Here is one of the most surprising facts in all of sports science: a smooth golf ball actually flies less far than a dimpled one. A smooth ball hit with the same force travels roughly half the distance.
This seems completely backwards. How can making a ball surface rougher make it fly farther?
When a smooth ball moves through air, the airflow separates from the surface very early, creating a large pocket of turbulent air behind it — massive drag. Dimples create tiny turbulences right next to the surface, keeping airflow attached longer and making the wake much smaller — dramatically reducing drag.
Dimples also help create lift — the upward force that keeps the ball airborne longer. A dimpled ball spinning backward creates uplift, like a spinning propeller.
Dimples reduce drag by keeping airflow attached to the surface longer.
Dimples help create lift by interacting with the ball’s spin.
A standard golf ball has between 300 and 500 dimples.
Look closely at a golf ball. Count the dimples in one small area and estimate the total. They are all precisely the same size arranged in a specific pattern — not random. This design took decades of research.
It took decades to figure out dimples were better than a smooth surface. What does this tell us about how science and invention work?
Dimple investigation: examine three golf balls if possible. Count dimples in one section and multiply to estimate the total. Look at the dimple shape — are they all circular? The same depth? Sketch each ball’s dimple pattern. Research question to answer with a parent: when were dimples first added to golf balls, and why?
The history of dimples is charming: early golfers noticed battered balls with nicks flew farther than new smooth ones. This is science emerging from observation — a perfect example of the scientific method.