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Radius of gyration, coefficient of restitution and other obscure forces cause tethered pins to fly around differently than their free-fall counterparts.

That official explained that MLB reworked the baseball before the 2021 season so that it would have a lower and more consistent coefficient of restitution, or COR.

The Korean Baseball Organization altered its ball in 2019, moving the coefficient of restitution — the relationship of incoming speed to outgoing speed — by 0.01 while also increasing the weight of the ball by less than one-twentieth of an ounce.

The faces are manufactured extra thin to be illegal under the rules for coefficient of restitution and the resin is used late in the process to then inch the clubs back into conforming status.

Who knows what kind of topics will be covered here—coefficient of restitution, predicative analysis ...