This is the 5028th most frequent Polish word.
potrzebny
Necessary.
Here 'potrzebna' indicates assistance that is anticipated to be required in the future.
Ta pomoc będzie potrzebna w przyszłym tygodniu.
This help will be needed next week.
Here, 'potrzebne' means 'needed', describing something required for a specific purpose.
Czy to narzędzie będzie potrzebne na lekcji?
Will this tool be needed in the lesson?
In this sentence, 'potrzebne' conveys the meaning of 'necessary', referring to something mandatory for a task.