A horizontal force of 10 N pushes a .5kg book against a vertical wall (the book

Question

A horizontal force of 10 N pushes a .5kg book against a vertical wall (the book is not resting on a table or any other horizontal surface; it is just held against a vertical wall). The book is initially at rest. If the coefficients of friction are Us=0.8 and Uk=0.6, which of the following is true? Take g=10m/s^2

A) The magnitude of the frictional force is 5 N.

B) The magnitude of the frictional force is 6 N.

C) The normal force is 5 N.

D) The book will start moving and accelerate.

E) None of the above is true

Explanation / Answer

force of friction = mu ( N)) =0.8 (10) = 8 N

weight of book =0.5 x 10 = 5 N

E) None of the above is true

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