What topic or topics of aviation MATH do you find the most difficult and why?

1. What topic or topics of aviation MATH do you find the most difficult and why?
2. What topic or topics of aviation PHYSICS do you find the most difficult and why?
3. What additional study/reference resources would you suggest to assist a student in understanding aviation math and physics topics?
4. Based on the aviation experience you already possess, draw some ties between the concepts covered in this week of content and the practical applications of the concepts in day-to-day flying, such as determining the radius of a turn based on the speed you are flying