Sometimes I have difficulty understanding things. And one of them was getting to grips with the fairly standard way of explaining how a wing generates lift.
The "standard" explanation always left me unsatisfied, like there was a bit missing. And I worked out my own way of thinking about it.
Then I found a book that explained things in a slightly different way - and wished I'd found it earlier of course.
If you understand what's going on when a wing moves through the air you ought to be able to answer this question. The answer and explanation are on another page.
The Question and Answer is taken from an American book "Thinking Physics". It's published by Insight Press, 614 Vermont Street, San Francisco, CA 94107, USA.
We have the publisher's written permission to use this article. "Thinking Physics" has an entirely non-mathematical approach to physics and covers Mechanics, Fluids, Heat, Vibrations, Light, Electricity & Magnetism, and Relativity, each of which follow the question-and-answer format. If you have a student in the family, and think it might help them, I'll let you have a look through my copy.