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Chapter 4: Q14. (page 99)

According to Newton鈥檚 third law, each team in a tug of war (Fig. 4鈥�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

A block is given an initial speed of 4.5 m/s up a 22.0掳 plane, as shown in Fig. 4鈥�59. (a) How far up the plane will it go? (b) How much time elapses before it returns to its starting point? Ignore the friction.

Figure 4鈥�53 shows a block (mass mA) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block (mB), which hangs vertically. (a) Draw a free-body diagram for each block, showing the force of gravity on each, the force (tension) exerted by the cord, and any normal force. (b) Apply Newton鈥檚 second law to find the formulas for the acceleration of the system and the tension in the cord. Ignore the friction and the masses of the pulley and the cord.

FIGURE 4-53 Problems 32 and 33. Mass mA rests on a smooth horizontal surface; mB hangs vertically.

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(b) exactly 950 N.

(c) more than 950 N.
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