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If it’s particularly hot, lace your shoes higher to prevent your foot from moving around in your shoe, which can cause too much skin friction.

The SST was being built with titanium alloy because supersonic “skin friction” would heat its hull to many hundreds of degrees Fahrenheit.

Neil Cronin, a human-locomotion researcher at the University of Jyväskylä in Finland, tweeted: “Finding funding for muscle research: difficult. Finding funding for banana skin friction study: easy apparently.”

The Jabulani ball was supposed to remedy some of the unpredictability created by skin friction and pressure drag.

Another kind of drag that affects trajectory is called skin friction drag — the interaction of air particles with the particles on the surface of the ball.