Sentence ending particle - の - sentence ending particle
When we use no as a sentence-ending particle, it indicates a colloquial question. When we use no in that way, we say this no with rising intonation. When we say no with falling intonation, it serves to soften the statement. Women and children usually employ this second usage.
■ Colloquial Question
The sentence-ending particle no said with rising intonation indicates a colloquial question.
Kyō nani suru no?
"What are you going to do today?"
■ Softening the Statement
The sentence-ending particle no said with falling intonation softens the statement. Women and children usually use no in this way.
Gakkō iku no.
"I'm going to go to school."
[non past casual form] + no