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Chapter 5: Q no. 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

A compressed spring is pushing a block across a rough horizontal table. How many force vectors would be shown on a free-body diagram? Name them.

Exercises 20 show a free-body diagram. For each, 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 single force with x-component Fxacts on a 500 g object as it moves along the x-axis. The object’s acceleration graph (ax versus t) is shown in FIGURE. Draw a graph of Fx versus t.

Problems 35 through 40 show a free-body diagram. For each:

a. Identify the direction of the acceleration vector au and show it as a vector next to your diagram. Or, if appropriate, write

b. If possible, identify the direction of the velocity vector and show it as a labeled vector.

c. Write a short description of a real object for which this is the

correct free-body diagram. Use Examples 5.4, 5.5, and 5.6 as

models of what a description should be like.

An object experiencing a constant force accelerates at 8m/s2.

What will the acceleration of this object be if

a. The force is halved? Explain.

b. The mass is halved?

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