Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 14 - Think and Do - Page 278-279: 38

Answer

This is a hands-on demonstration. The rapidly-moving air flowing between the spool endcap and the card causes a low pressure region, by Bernoulli's principle. The atmospheric pressure on the other face of the card forces the card against the spool.

Work Step by Step

This is discussed on page 275, and similar to the exercise in Practicing Physics.
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