University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 7 - Potential Energy and Energy Conservation - Problems - Discussion Questions - Page 228: Q7.10


See explanation.

Work Step by Step

a. When the block is pressed against the spring, compressing it, the displacement and the spring force are in opposite directions, so the spring force does negative work. The potential energy stored in the spring increases – it has more PE when it is more compressed. b. Here the displacement is upward, and the spring force is also upward, so the spring force does positive work. The potential energy stored in the spring decreases – it has less PE when it is not compressed as far.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.