   Chapter 5, Problem 13CQ

Chapter
Section
Textbook Problem

Suppose you are reshelving books in a library. As you lift a book from the floor and place it on the top shelf, two forces act on the book: your upward lifting force and the downward gravity force. (a) Is the mechanical work done by your lifting force positive, zero, or negative? (b) Is the work done by the gravity force positive, zero, or negative? (c) Is the sum of the works done by both forces positive, zero, or negative?

(a)

To determine
Whether the mechanical work done by the lifting force is positive, zero or negative.

Explanation

The mechanical work done is,

W=fs

• f is the force
• s is the displacement

Since, the boy is lifting the books from floor to top

(b)

To determine
Whether the mechanical work done by the gravity force is positive, zero or negative.

(c)

To determine
Whether the sum of the work done by both the forces are positive, zero or negative.

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