4th Edition

ISBN: 9780134700427

Author: Knight

Publisher: PEARSON

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The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”

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Textbook Question

Chapter 4, Problem 77MSPP

If your car is stuck in the mud and you don't have a winch to pull it out, you can use a piece of rope and a tree to do the trick. First, you tie one end of the rope to your car and the other to a tree, then pull as hard as you can on the middle of the rope, as shown in Figure P4.68 a. This technique applies a force to the car much larger than the force that you can apply directly. To see why the car experiences such a large force, look at the forces acting on the center point of the rope, as shown in Figure P4.68 b. The sum of the forces is zero, thus the tension is much greater than the force you apply. It is this tension force that acts on the car and, with luck, pulls it free.

Chapter 4, Problem 77MSPP, If your car is stuck in the mud and you don't have a winch to pull it out, you can use a piece of

Figure P4.68

71. Suppose your efforts work, and the car begins to move forward out of the mud. As it does so, the force of the car on the rope is

A. Zero.

B. Less than the force of the rope on the car.

C. Equal to the force of the rope on the car.

D. Greater than the force of the rope on the car.

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Chapter 4, Problem 76MSPP

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