Physics discovery explains why sneakers squeak
Popular Science
by Andrew PaulFebruary 25, 2026
AI-Generated Deep Dive Summary
Sneakers squeaking on a basketball court are an everyday sound that has long puzzled scientists. While stick-slip friction was thought to explain the noise, new research reveals a more complex dynamic at play. By studying the interaction between rubber soles and surfaces, researchers discovered that the frequency of squeaks is determined by propagating pulses, influenced by factors like material stiffness and surface geometry. This breakthrough not only explains why sneakers make noise but also opens doors for advancements in materials science and engineering.
The study, published in *Nature*, involved advanced imaging techniques and high-speed cameras to capture the intricate movements at the point of contact between surfaces. Unlike previous theories, which assumed randomness, the research showed that the geometry of the materials significantly shapes how friction generates sound. For instance, flat-sided rubber blocks produced irregular, swishing noises, highlighting the role of shape in frictional dynamics.
Beyond sneakers, this understanding has far-reaching implications. It could lead to the development of tunable frictional metamaterials—materials that can switch between low-friction and high-grip states on demand. This innovation could benefit fields like robotics and manufacturing, where controlling friction is crucial for performance and efficiency. Additionally, the findings may help improve earthquake models by offering insights into how tectonic faults generate energy-releasing slip pulses.
The research also demonstrates the importance of surface features in determining frictional behavior. By challenging traditional one-dimensional models, the study emphasizes that a more nuanced approach is needed to fully grasp friction's complexities. This shift could lead to quieter, more efficient technologies and even inspire new ways to manipulate friction for specific applications, from reducing noise in machinery to enhancing grip in extreme conditions.
Ultimately, this discovery bridges the gap between everyday phenomena like squeaking
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Originally published on Popular Science on 2/25/2026