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Chapter 4: Q2CQ (page 159)

What properties do forces have that allow us to classify them as vectors?

Short Answer

Expert verified

The properties of forces that classify them as vectors are the magnitude and direction.

Step by step solution

01

Introduction of force and vector

Force is defined as a push or pull. When force is applied to a body, it has both the magnitude of the force and the direction of the application of force.

A vector is a geometrical identity that has both magnitude and direction.

02

Properties of forces that classify them as vectors

The properties of forces that classify them as vectors are the magnitude of the force as well as its direction. There are two types of forces one is the direct contact force, and the other is the force applied at a distance. Examples of direct contact force are friction force, normal force, etc., and the examples of force applied at a distance are gravitational force, electromagnetic force, etc.

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Most popular questions from this chapter

Figure 4.39 shows Superhero and Trusty Sidekick hanging motionless from a rope. Superhero鈥檚 mass is 90.0 kg, while Trusty Sidekick鈥檚 is 55.0 kg, and the mass of the rope is negligible.

(a) Draw a free-body diagram of the situation showing all forces acting on Superhero, Trusty Sidekick, and the rope.

(b) Find the tension in the rope above Superhero.

(c) Find the tension in the rope between Superhero and Trusty Sidekick. Indicate on your free-body diagram the system of interest used to solve each part.

The gravitational force on the basketball in Figure 4.6 is ignored. When gravity is taken into account, what is the direction of the net external force on the basketball鈥攁bove horizontal, below horizontal, or still horizontal.

When you take off in a jet aircraft, there is a sensation of being pushed back into the seat. Explain why you move backward in the seat鈥攊s there really a force backward on you? (The same reasoning explains whiplash injuries, in which the head is apparently thrown backward.)

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掳? In this part, explicitly show how you follow the steps in the Problem-Solving Strategy for Newton鈥檚 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掳 and you still apply the force found in part (a) to its center?

How are inertia and mass related?
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