   Chapter 4, Problem 18CQ

Chapter
Section
Textbook Problem

If an object is in equilibrium, which of the following statements is not true? (a) The speed of the object remains constant. (b) The acceleration of the object is zero. (c) The net force acting on the object is zero. (d) The object must be at rest. (e) The velocity is constant.

(a)

To determine

To say True or False: The speed of the object remains constant.

Explanation
The net force is zero. Therefore, acceleration is equal to zero. The change in velocity can be expressed as,

dv=(a)dt

• a is the acceleration
• dt is the change in time

Substitute 0 for a in the expression for the change in velocity

(b)

To determine

To say True or False: The acceleration of the object is zero.

(c)

To determine

To say True or False: The net force acting on the object is zero.

(d)

To determine

To say True or False: The object must be at rest.

(e)

To determine

To say True or False: The velocity is constant.

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