   Chapter 4.2, Problem 4.1QQ

Chapter
Section
Textbook Problem

Which of the following statements are true? (a) An object can move even when no force acts on it. (b) If an object isn’t moving, no external forces act on it. (c) If a single force acts on an object, the object accelerates. (d) If an object accelerates, at least one force is acting on it. (e) If an object isn’t accelerating, no external force is acting on it. (f) If the net force acting on an object is in the positive x-direction, the object moves only in the positive x-direction.

(a)

To determine

To say True or False: An object can move even when no force acts on it.

Explanation

Force is defined as an interaction that changes the motion of the object. It can be expressed as the product of mass of the object and its acceleration.

When no force acts on the object, its acceleration is zero...

(b)

To determine

To say True or False: If an object is not moving, no external forces act on it.

(c)

To determine

To say True or False: If a single force acts on an object, the object accelerates.

(d)

To determine

To say True or False: If an object accelerates, at least one force is acting on it.

(e)

To determine

To say True or False: If an object isn’t accelerating no external force is acting on it.

(f)

To determine

To say True or False: If the net force acting on an object is in the positive x direction, the object moves only in the positive x direction.

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