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Chapter 4: Q14. (page 99)

According to Newton’s third law, each team in a tug of war (Fig. 4–37) pulls with the force equal to that of the other team. What determines which team will win? Describe the forces on each of the teams and on the rope.

FIGURE 4-37 Question 14. A tug of war

Short Answer

Expert verified

The team that pushes the hardest against the ground will win.

Step by step solution

01

Step 1. Meaning of frictional force

The frictional force can be described as the kind of force that resists the movement of an object.

The direction of this force is opposite to the direction of the object's movement, and its magnitude depends on the normal force working on an object.

02

Step 2. Application of Newton’s third law

As the value of the tension in the rope is the same for both teams, it's the force of friction on their feet that wins the tug of war. For the team that pushes forward on the ground with the greatest force, the ground pushes back and leads them away from their initial point in the right direction and leads the opposite team towards the centerline.

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Most popular questions from this chapter

To pull an old stump out of the ground, you and a friend tie two ropes to the stump. You pull on it with a force of 500 N to the north while your friend pulls with a force of 450 N to the northwest. The total force from the two ropes is

(a) less than 950 N.

(b) exactly 950 N.

(c) more than 950 N.

(a) IfmA=13.0kg,andmB=5.0kgin Fig. 4–53, determine the acceleration of each block. (b) If initially, it is at rest at 1.250 m from the edge of the table, how long does it take to reach the edge of the table if the system is allowed to move freely? (c) IfmB=1.0kg, how large mustmAbe if the acceleration of the system is to be kept at1100g?

One 3.2-kg paint bucket is hanging by a massless cord from another 3.2-kg paint bucket, also hanging by a massless cord, as shown in Fig. 4–49. (a) If the buckets are at rest, what is the tension in each cord? (b) If the two buckets are pulled upward with an acceleration of by the upper cord, calculate the tension in each cord.

If the coefficient of the kinetic friction between a 22 kg crate and the floor is 0.30, what horizontal force is required to move the crate at a steady speed across the floor? What horizontal force is required ifμkis zero?

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
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