The Magnus effect is a lift force
of tremendous importance to all athletes who want to bend the flight of
the ball. As the spinning ball moves through the air, it spins a
boundary layer of air that clings to its surface as it travels along. On
one side of the ball the boundary layer of air collides with air
passing by. The collision causes air to decelerate creating a high
pressure area. On the opposing side, the boundary layer is moving in the
same direction as the air passing by, so there is no collision and the
air collectively moves faster. The pressure differential, high on one
side and low on the other, creates a lift force that causes the ball to
move in the direction of the pressure differential (Human Kinetics,
2013) (see image below).
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