Spin a ball and it curves — the same force that makes a slice
A ball spinning as it moves through air drags a thin layer of air around with it, speeding up airflow on one side and slowing it on the other. The resulting pressure difference pushes the ball sideways, curving a soccer free kick around a wall of defenders or sending a badly hit golf shot slicing off the fairway. Heinrich Gustav Magnus first described the effect studying spinning artillery shells in 1852.