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Chapter 4: Q8CQ (page 159)

Describe a situation in which the net external force on a system is not zero, yet its speed remains constant.

Short Answer

Expert verified

Any body moving in a circular path has centripetal acceleration, where the speed of the body remains constant when some external force acts on it.

Step by step solution

01

Defining Newton’s second law of motion

Newton’s second law of motion states that the acceleration of a system is directly proportional to the net external force acting on the system and is inversely proportional to the mass of the system.Mathematically

Fnet=ma

Here,Fnet is the net force, m is the mass, and a is the acceleration.

02

Explanation for situation of nonzero net external force having constant speed

In the situation where a body is moving in a circle with centripetal acceleration, the net external force acts on the body with the speed remaining constant. In this case, the force is applied perpendicular to the direction of velocity, which changes its direction without changing the speed.

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Most popular questions from this chapter

(a) What is the ratio of the strength of the gravitational force to that of the strong nuclear force?

(b) What is the ratio of the strength of the gravitational force to that of the weak nuclear force?

(c) What is the ratio of the strength of the gravitational force to that of the electromagnetic force? What do your answers imply about the influence of the gravitational force on atomic nuclei?

How are inertia and mass related?

Suppose your car was mired deeply in the mud, and you wanted to use the method illustrated in Figure 4.37 to pull it out.

(a) What force would you have to exert perpendicular to the center of the rope to produce a force of 12,000 N on the car if the angle is 2.00°? In this part, explicitly show how you follow the steps in the Problem-Solving Strategy for Newton’s laws of motion.

(b) Real ropes stretch under such forces. What force would be exerted on the car if the angle increases to 7.00° and you still apply the force found in part (a) to its center?

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(a) Calculate its the magnitude of acceleration in a vertical takeoff from the Moon.

(b) Could it lift off from Earth? If not, why not? If it could, calculate the magnitude of its acceleration.

A cartoon shows the toupee coming off the head of an elevator passenger when the elevator rapidly stops during an upward ride. Can this really happen without the person being tied to the floor of the elevator? Explain your answer.
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