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Chapter 4: Q3. (page 98)

If the object is moving, it is possible for the net force acting on it to be zero? Explain.

Short Answer

Expert verified

Yes, when the object is moving with a constant velocity, the net force on it must be zero.

Step by step solution

01

Step 1. By Newton’s second law

The acceleration of an object is directly proportional to the force applied to it.

02

Step 2. Case of an object moving with uniform velocity

If an object is moving with uniform velocity, its acceleration must be zero. From Newton’s second law, you know that acceleration is directly proportional to force and follows the relationF=ma.

Here, m is the mass of the object, F is the force applied, and a is the acceleration.

Thus, acceleration being zero implies that the net force will also be zero. Therefore, it is possible that the net force on a moving object is zero.

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Most popular questions from this chapter

A person pushes a 14.0-kg lawn mower at constant speed with a force ofF=88.0Ndirected along the handle, which is at an angle of 45.0° to the horizontal (Fig. 4–58). (a) Draw the free-body diagram showing all forces acting on the mower. Calculate (b) the horizontal friction force on the mower, then (c) the normal force exerted vertically upward on the mower by the ground. (d) What force must the person exert on the lawn mower to accelerate it from rest to 1.5 m/s in 2.5 seconds, assuming the same friction force?

FIGURE 4-58 Problem 50.

Suppose the pulley in Fig. 4–55 is suspended by a cord C. Determine the tension in this cord after the masses are released and before one hits the ground. Ignore the masses of the pulley and cords.

FIGURE 4-55 Problem 35

A 20.0 kg box rests on a table. (a) What is the weight of the box and the normal force acting on it? (b) A 10.0 kg box is placed on top of the 20.0 kg box, as shown in Fig. 4-43. Determine the normal force that the table exerts on the 20.0 kg box and the normal force that the 20.0 kg box exerts on the 10.0 kg box.

Why does a child in a wagon seems to fall backward when you give the wagon a sharp pull forward?

(a) You pull a box with a constant force across a frictionless table using an attached rope held horizontally. If you now pull the rope with the same force at an angle to the horizontal (with the box remaining flat on the table), does the acceleration of the box increase, decrease, or remain the same? Explain. (b) What if there is friction?
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