Physics

Physics

Problem

Questions 14-15 ![](https://storage.googleapis.com/diraq-contents/question-bank/question-images/02bc4a7032e0/2025_11_20_d449413caa020e6315ffg-04.jpg) A block of mass mm is accelerated across a rough surface by a force of magnitude FF that is exerted at an angle ϕ\phi with the horizontal, as shown above. The frictional force on the block exerted by the surface has magnitude f. 15. What is the coefficient of friction between the block and the surface? (A) f/mg\mathrm{f} / \mathrm{mg} (B) mg/f\mathrm{mg} / \mathrm{f} (C) (mg−Fcos⁡ϕ)/f(\mathrm{mg}-\mathrm{F} \cos \phi) / \mathrm{f} (D) f/(mg−Fcos⁡ϕ)\mathrm{f} /(\mathrm{mg}-\mathrm{F} \cos \phi) (E) f/(mg−Fsinϕ)\mathrm{f} /(\mathrm{mg}-\mathrm{Fsin} \phi)

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