Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 6 - Applications of Newton's Laws - Conceptual Questions - Page 177: 15

Answer

Please see the work below.

Work Step by Step

When the students sit on the trunk of the car, they actually increase the normal force between the tires and the road (by increasing the weight of the car which equals the normal force). We know that friction is directly proportional to the normal force and thus the force of friction is increased, which helps the car move.
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