7. Three 2A students argue whether the following formulas for kinetic friction a

Question

7. Three 2A students argue whether the following formulas for kinetic friction are equivalent: Allen says that f uN, while Rosa says f uN and Nate claims it is obvious that both forms are correct. Who is right? Explain. 8. A brick of mass m- 2.0 kg is held against a rough wall by a horizontal force F 30 N, as shown. a. Draw the FBD for the brick b. If the brick is about to slip, determine the coefficient of static friction between the wall and the brick Explain what happens if the wall is smooth. c. Consider problem 8, except the force, F, is applied as shown, where .-.4 and = 35. What minimum and maximum force is needed to keep the brick in equilibrium? (There are two distinct answers.) 9.

Explanation / Answer

Answer (7).Allen is correct and because friction is not a vector quantity i.e. it does not depends on direction it only depends on roughness of surface and normal force acting on the surface

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