   Chapter 5, Problem 8CQ

Chapter
Section
Textbook Problem

Discuss whether any work is being done by each of the following agents and, if so, whether the work is positive or negative: (a) a chicken scratching the ground, (b) a person studying, (c) a crane lifting a bucket of concrete, (d) the force of gravity on the bucket in part (c), (e) the leg muscles of a person in the act of sitting down.

(a)

To determine
Whether there is any work is being done when a chicken is scratching the ground.

Explanation

The definition for work is,

W=Fd

• F is the magnitude of the force acting on the object
• d is the magnitude of the object’s displacement

When a

(b)

To determine
Whether there is any work is being done when a person is studying.

(c)

To determine
Whether there is any work is being done when a crane is lifting a bucket of concrete.

(d)

To determine
Whether there is any work is being done by force of gravity in part (c)

(e)

To determine
Whether there is any work is being done by the leg muscles of a person in the act of sitting down.

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