I'm not much of a maths expert, so this is probably quite straight forward. I was playing a soccer flash game where you take free kicks. You provide Power, Swerve and Direction. I'm reading up on vectors and such so I can use the direction and power information to shoot the ball with the correct velocity.
What I don't understand is how the 'Swerve' information is used. What formula connects the Swerve information with the Direction and Power? (ThisThis is all inassuming a 2D) environment.