Airflow www.kent.k12.wa.us/staff/trobinso/physicspages/po2001/soccer In many situations throughout a soccer game it is necessary to make a ball curve around someone and due to airflow against the ball this is possible to do.  To get a ball to curve you must first put it into a rotating motion.  To do this you need to initially kick the ball off-center so that a side spin is created.  A low-drag and high-turbulant airflow is then working agains the ball causing the spin.  But, the speed that the ball is kicked at can also directly effect the curve you get from the ball.  If the ball is kicked too hard it will enter a smooth-airflow, or laminar, phase.  This can create a large amount of drag and in turn brings in Bernoulli's principle and a large sideways force.  This force causes the ball to curve in a direction that is hopefully the one you desired.                                        Bernoulli's principle shows that the ball in motion will have an effect due to the airspeed above and              www.desktoppub.about.com                                        below it.  The balls movement will also be effected because of the spin (rotation) put on it.  Bernoulli's                                                                                principle shows that there is a lift pushing out to the side because of the rotation due to air pressure giving it                                        a lift. usarios.lycos.es/rcarlospage/robertoimagenes.htm