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# A Simple Solution for a Stuck Car If your car is stuck in ISBN: 9780130606204 3

## Solution for problem 71PP Chapter 4

Physics: Principles with Applications | 6th Edition

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Problem 71PP

A Simple Solution for a Stuck Car 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 P4.68a. 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 P4.68b. 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. Assume that you are pulling on the rope but the car is not moving. What is the approximate direction of the force of the mud on the car? A. North B. South C. East D. West

Step-by-Step Solution:

SOLUTION: Step 1 of 1 According to newton's second law The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. In the above case , more forces acting on the car than the middle of the rope where you going to pull si this is the reason car will not accelerate due to awe are applying small force rather than car force so there is no acceleration The force of the car is greater than the applied force so the tension force is more, where the applied force will large but which acts opposite to that applied force. Tension is a pulling force which exerts when the mass is attached to rope, cable, or string and pulling which is opposite to the direction of applied force and it is developed in inside the material. In the above case, the applied force direction is towards west so the direction of the tension force is opposite to that and the force of mud is acting on the car along with same direction means eastward direction So the option ( c ) is correct

Step 2 of 1

##### ISBN: 9780130606204

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A Simple Solution for a Stuck Car If your car is stuck in