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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 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?

Exercises 26 describe a situation. Identify all forces acting on the object and draw a free-body diagram of the object.

A steel beam, suspended by a single cable, is being lowered by a crane at a steadily decreasing speed.

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�.

In lab, you propel a cart with four known forces while using an

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should you graph on the horizontal axis and what on the

vertical axis?

b. Is there another data point that would be reasonable to add,

even though you made no measurements? If so, what is it?

c. What is your best determination of the cart鈥檚 mass?

Redraw the two motion diagrams shown in the FIGURE , then draw a vector

beside each one to show the direction of the net force acting on the object.

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