
The elliptical posts
These are different because the shape makes a rebound more unpredictable and they are stronger.
The modern cross bar is reinforced with a metal rod to give it more suppleness without breaking. Previously cross bars tended to sag. Today they are actually manufactured in a 'banana shape' so that when hung between the uprights the curve is straightened by the force of gravity.
Most wooden goalposts are made from hardwearing Douglas Fir. It needs only one pitch invasion to damage them. Also to prevent damage and accidents, goal keepers are banned from swinging on crossbars.
Instead of wood some goalposts are made of aluminium. They are much lighter and need less maintenance.
To score a goal the whole ball must pass between the goal posts, under the cross bar and across the goal line (which is, of course, part of the perimeter line).
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