Sets the friction value to use for this sprite during physics calculations. Should be in the range 0 to 1. By default this sets all the shapes assigned to this sprite to the same value, you can instead set it on a per shape basis by specifying a shapeID greater than 0. Shape IDs start at 1 for the first shape, with 0 meaning apply it to all shapes.
SetSpritePhysicsFriction( iSpriteIndex, friction, shapeID )
SetSpritePhysicsFriction( iSpriteIndex, friction )