A Boy Pulls a Wooden Box Along a Rough Horizontal

question 70

Multiple Choice

A boy pulls a wooden box along a rough horizontal floor at constant speed by means of a force as shown. In the diagram f is the magnitude of the force of friction, N is the magnitude of the normal force, and F_g is the magnitude of the force of gravity. Which of the following must be true?

• A) P = f and N = F_g
• B) P = f and N > F_g
• C) P > f and N < F_g
• D) P > f and N = F_g
• E) none of these

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