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You hold a 0.8 kg book against a vertical wall by pushing against it perpendicular to...

You hold a 0.8 kg book against a vertical wall by pushing against it perpendicular to the plane of the wall. If the coefficient of kinetic friction is 0.1 and the coefficient of static friction is 0.4, what is the minimum force you need to apply to the book to keep it from slipping?

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Answer #1

The force that we apply on the book will act as normal reaction between the book and the wall. Let this force be F.

Static Frictional force = Weight of the book

     where is coefficient of static friction

     (Taking g = 10m/s2)

  

Minimum force needed to keep the book from slipping is 20N

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