The decision concerning whether to cover the pitch greatly affects how the ball will react to the pitch surface, as a ball bounces differently on wet ground as compared to dry ground.
22.
There are many options and features, for example, the pitch surface changes field conditions in outdoor FIFA Rules affects whether or not extra time will use the " Golden Goal " ( sudden death ) rules-since abolished.
23.
The "'profile angle "'of a gear is the angle at a specified pitch point between a line tangent to a tooth surface and the line normal to the pitch surface ( which is a radial line of a pitch circle ).
