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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Hammering the iron requires a force and this force causes the hot iron to change the shape of iron. Thus, hot iron can be moulded in the shape as required.