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Question: Answered & Verified by Expert
A girl holds a book of mass $\mathrm{m}$ against a vertical wall with a horizontal force $\mathrm{F}$ using heer fingér so that the book does not move. The frictional force on the book by the wall is $-$
PhysicsMotion In Two DimensionsKVPYKVPY 2012 (SA)
Options:
  • A $\mathrm{F}$ and along the finger but pointing towards the girl
  • B $\mu \mathrm{F}$ upwards where $\mu$ is the coefficient of static friction
  • C $\mathrm{mg}$ and upwards
  • D Equal and opposite to the resultant of $\mathrm{F}$ and $\mathrm{mg}$
Solution:
1361 Upvotes Verified Answer
The correct answer is: $\mathrm{mg}$ and upwards

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