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Chapter 5: Q. 9 (page 127)

If an object is at rest, can you conclude that there are no forces acting on it? Explain.

Short Answer

Expert verified

No, we couldn't conclude that there are no forces acting on it.

Step by step solution

01

step-1 Given Information :

The object is in the state of rest.

02

Step-2  Simplification :

Newton 's first law states that an object that is at rest will remain at rest or an object that is moving will continue to move in a straight line with constant velocity, if and only if the net force acting on the object is zero. This means when the object is at rest, the net force on it, is zero but there are more than one force act on it but the forces act on it with the same magnitude in the opposite direction.

For example, a book on a table, the earth exerts a force gravity on it down while the table exerts a normal force on it upward with the same magnitude, so it remains at the rest.

Hence, the answer is no, we couldn't conclude that there are no forces acting on it.

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Most popular questions from this chapter

Problems 42 through 52 describe a situation. For each, draw a motion diagram, a force-identification diagram, and a free-body diagram.

You’ve jumped down from a platform. Your feet are touching

the ground and your knees are flexing as you stop.

Exercises 21 show a free-body diagram. Write a short description of a real object for which this would be the correct free-body diagram. Use Examples 5.4, 5.5, and 5.6 as examples of what a description should be like.

A heavy box is in the back of a truck. The truck is accelerating to the right. Draw a motion diagram, a force-identification diagram, and a free-body diagram for the box .

7. An object experiencing a constant force accelerates at 10 m/s2. What will the acceleration of this object be if

a. The force is doubled? Explain.

b. The mass is doubled?

c. The force is doubled and the mass is doubled?

An object experiencing a constant force accelerates at 10m/s2. What will the acceleration of this object be if

a. The force is doubled? Explain.

b. The mass is doubled?

c. The force is doubled and the mass is doubled?
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