A Horizontal Force of 12 N Pushes a 0 $\mu$ _s = 0

question 53

Multiple Choice

A horizontal force of 12 N pushes a 0.5-kg bookk against a vertical wall. The book is initially at rest. If the coefficients of friction are $\mu$ _s = 0.6 and $\mu$ _k = 0.8 which of the following is true?

• A) The frictional force is 4.9 N
• B) The frictional force is 7.2 N
• C) The normal force is 4.9 N
• D) The block will start moving and accelerate
• E) If started moving downward, the block will decelerate

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