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Statement of a problem № 10143

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A 9.3-kg box slides across the floor of an elevator with a coefficient of kinetic friction equal to 0.38. (a) What is the force of kinetic friction acting on the box when the elevator is at rest? (b) If the elevator moves upward with constant acceleration, is the force of kinetic friction acting on the box greater than, less than, or equal to the value found in part (a)? Explain. (c) Determine the force of kinetic friction acting on the sliding box when the elevator moves upward with a constant acceleration of 1.4 m/s2.




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