Why do sports shoes squeak? Here’s what our research reveals

The unofficial soundtrack of every basketball, squash or hard-court tennis match is the constant high-pitched squeak or shreak of the players’ shoes. But can this squeak be designed out of them while retaining the grip?

That’s the question an international team of engineers and applied physicists, including me, have been investigating. It sounds like a small design tweak. In fact, it cuts to a deep physics problem: how a soft body slides against a rigid one.

Perhaps surprisingly...