Physics

Physics

Problem

2. A force F at an angle θ\theta above the horizontal is used to pull a heavy suitcase of weight mg a distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is μ\mu. The work done by the frictional force is: (A) −Fdcos⁡θ-\mathrm{Fd} \cos \theta (B) −μFdcos⁡θ-\mu \mathrm{Fd} \cos \theta (C) −μmgd-\mu \mathrm{mgd} (D) −μmgdcos⁡θ-\mu \mathrm{mgd} \cos \theta (A) −Fdcos⁡θ-\mathrm{Fd} \cos \theta (B) −μFdcos⁡θ-\mu \mathrm{Fd} \cos \theta (C) −μmgd-\mu \mathrm{mgd} (D) −μmgdcos⁡θ-\mu \mathrm{mgd} \cos \theta

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