Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 6 - Work and Energy - Questions: 15

Answer

a. Golf. The player raises the club, doing positive work on the club and giving it initial potential energy. On the downswing, the player does more work on the club. This work and the transformation of potential energy will increase the club’s kinetic energy. At the bottommost point in the swing (the club’s kinetic energy reaches a maximum), the club hits the ball. This transfers some of the club’s kinetic energy to the ball. b. Tennis. The player tosses the ball, doing positive work on it and giving it initial kinetic energy. The ball rises to its high point, and the kinetic energy is transformed to potential energy. Meanwhile, the player does work on the racket to increase its kinetic energy. When the racket hits the ball, this transfers some of the racket’s kinetic energy to the ball. c. Basketball. The player tosses the ball, doing positive work on it and giving it initial kinetic energy. The ball rises to its high point, some of the kinetic energy is transformed to potential energy. At the highest point, the potential energy is maximum and the KE is minimum. Then, the ball starts to come down, and some of the potential energy transforms into kinetic energy.

Work Step by Step

Consider each change in movement and contact point in terms of its energy transformation.
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