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Chapter 4: Q19. (page 99)

A heavy crate rests on the bed of a flatbed truck. When the truck accelerates, the crate stays fixed on the truck, so it, too, accelerates. What force causes the crate to accelerate?

Short Answer

Expert verified

The static frictional force causes the crate to accelerate.

Step by step solution

01

Step 1. Conditions of friction

In order to determine the force between the crate and the truck, you have to use the properties of friction. Basically, three situations cause friction, which are as follows:

(1) Surface roughness

(2) Plowing effect

(3) Molecular adhesion

02

Step 2. Determine the force that causes the crate to accelerate

A heavy crate rests on the bed of a truck when it starts to accelerate. This causes the heavy crate to accelerate because of the static friction between the truck and the crate. Since they are in contact with each other, friction is developed between them due to surface roughness.

Thus, the crate accelerates due to static frictional force.

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Most popular questions from this chapter

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

Three blocks on a frictionless horizontal surface are in contact with each other, as shown in Fig. 4–54. A forceF→is applied to block A (mass mA). (a) Draw a free-body diagram for each block. Determine (b) the acceleration of the system (in terms of mA, mB, and mC), (c) the net force on each block, and (d) the force of contact that each block exerts on its neighbor. (e) IfmA=mB=mC=10.0kg,andF=96.0N,give numerical answers for (b), (c), and (d). Explain how your answers make sense intuitively.

FIGURE 4-54 Problem 34

You are trying to push your stalled car. Although you apply a horizontal force of 400 N to the car, it doesn’t budge, and neither do you. Which force(s) must also have a magnitude of 400 N?(a) The force exerted by the car on you.(b) The friction force exerted by the car on the road.(c) The normal force exerted by the road on you.(d) The friction force exerted by the road on you.

Question: (II) The block shown in Fig. 4–59 has massm=7.0kgand lies on a fixed, smooth, frictionless plane tilted at an angle ofθ=22.0°to the horizontal. (a) Determine the acceleration of the block as it slides down the plane. (b) If the block starts from rest at 12.0 m above the plane from its base, what will be the block's speed when it reaches the bottom of the incline?

The crate shown in Fig. 4–60 lies on a plane tilted at an angle θ=25.0oto the horizontal, with μk=0.19. (a) Determine the acceleration of the crate as it slides down the plane. (b) If the crate starts from rest 8.15 m up along the plane from its base, what will be the crate’s speed when it reaches the bottom of the incline?

FIGURE 4–60 Crate on inclined plane. Problems 59 and 60
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