drag

Drag vs Speed

The variation of drag force with ball speed. At high speeds, the drag force falls, which means that the ball does not slow down as much as expected. First published in Physics World magazine, June 1998 pp25–27.  https://physicsworld.com/a/the-physics-of-football/

Soccer Turbulent Air & Drag

When the airflow over a ball is turbulent, the boundary layer sticks to the ball almost until the air has completely passed over the ball. This produces late separation and a small drag. First published in Physics World magazine, June 1998 pp25–27.  https://physicsworld.com/a/the-physics-of-football/

Ball Drag

The drag coefficient of a ball plotted against Reynold’s number – a non-dimensional parameter that takes into account both the velocity and diameter of the ball. The drag coefficient drops suddenly when the airflow at the surface of the sphere changes from laminar to turbulent. The position of the discontinuity depends on the roughness of …

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