HW4 solutions - HomeWork 4 solutions 1. Chapter 4 Problem...

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HomeWork 4 solutions Physics 203 1. Chapter 4 Problem 44 REASONING a. Since the refrigerator does not move, the static frictional force must be equal in magnitude, but opposite in direction, to the horizontal pushing force that the person exerts on the refrigerator. b. The magnitude of the maximum static frictional force is given by Equation 4.7 as MAX s sN fF µ = . This is also the largest possible force that the person can exert on the refrigerator before it begins to move. Thus, the factors that determine this force magnitude are the coefficient of static friction s and the magnitude F N of the normal force (which is equal to the weight of the refrigerator in this case). SOLUTION a. Since the refrigerator does not move, it is in equilibrium, and the magnitude of the static frictional force must be equal to the magnitude of the horizontal pushing force. Thus, the magnitude of the static frictional force is 267 N . The direction of this force must be opposite to that of the pushing force, so the static frictional force is in the + direction x .
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This note was uploaded on 06/22/2009 for the course PHYS 1101 taught by Professor Richardson, b during the Fall '08 term at Cornell University (Engineering School).

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HW4 solutions - HomeWork 4 solutions 1. Chapter 4 Problem...

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