College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 4 - Force and Motion - Learning Path Questions and Exercises - Conceptual Questions - Page 133: 15

Answer

Free body diagram

Work Step by Step

the force F is the combination of the pushing of seat back and the friction force by seat surface. While take off the F force parallel to the surface and at an angle $20^{\circ}$ the plane is inclined from the surface.
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