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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

A chandelier hangs from a chain in the middle of a dining

room. Identify the forces on the chandelier.

Exercise 19 show two of the three forces acting on an object in equilibrium. Redraw the diagram, showing all three forces. Label the third force F3鈫�.

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

Your friend went for a loop-the-loop ride at the amusement

park. Her car is upside down at the top of the loop.

A constant force applied to A causes A to accelerate at 5m/s2 . The same force applied to B causes an acceleration of 3m/s2 . Applied to C, it causes an acceleration of 8m/s2.

a. Which object has the largest mass? Explain.

b. Which object has the smallest mass?

c. What is the ratio mAmBof the mass of A to the mass of B?

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

a. Identify the direction of the acceleration vector a鈫�and show it as a vector next to your diagram. Or, if appropriate, write a鈫�=0鈫�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.
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