What is the requirement for a force to come into play?
What is the magnitude of the resultant force when two forces act in same direction?
What will be the magnitude of the resultant force when two forces act in opposite directions on an object?
What happens in a game of tug of war, when two teams pull equally hard?
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When air is pumped into a tube, the pressure inside the tube becomes more than the atmospheric pressure and exerts outward pressure, thus inflating the tube.