The ball should be declared unplayable before the game. Several balls are approved by the referee for every game and should be interchangable . ou merely exclude the nonconforming ball.
-- The ball is manufactured in such a way as to have the specified final weight. -- A ball with more or less than the specified weight would not be eligible to be used in competition, and would be removed from play by the officials.
People would play other sports, and there would be no football.
what would happen to a car if its reaction force was less than the weight
If you were on the moon your weight would lower, as there is no gravity.
The ref would die
It would increase slowly, depending on your metabolism.
It would stretch, and its tension would increase.
Your weight in space would decrease because the one and only reason is that, there is no gravitation in space.
If earth's mass were to remain the same, your weight would be constant, i.e. it would not change.
You would loose weight
it might have a chance of lossing the game.
by sinking