Final answer:
The underlined stage direction in the excerpt creates a calm mood by emphasizing the rocker as a symbol of pacification.
Step-by-step explanation:
The underlined stage direction in the excerpt from part one of Trifles affects the mood of the scene by creating a calm mood. The emphasis on the rocker reminds the reader of something that is typically used to pacify or soothe individuals. In this context, the rocker becomes a symbol of calmness and stability amidst the potentially tense situation.
Learn more about The effect of stage directions on the mood of a scene