roughness

The team used 31 industrial sandpapers with surfaces of varying roughness, ranging from 1 to 100 microns thick, as experimental targets.

Chargers rookie cornerback Cam Hart was called for unnecessary roughness while breaking up a second-down pass with 1:51 remaining, moving the Cardinals to their 45-yard line.

The safety was suspended without pay after drawing an unnecessary roughness penalty on a tackle against the Steelers.

Since the start of the 2023 season, the 28-year-old has drawn five unnecessary roughness penalties in 18 games, which is the most among defensive players, according to the Associated Press.

"Others said they did see some roughness on the liquid surface but weren't sure if waves caused it."