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Homework Help: Two little questions about friction

  1. Jun 27, 2008 #1
    1. How can you determine a coefficient of friction with only acceleration as a given variable ?
    I have a problem with a book resting on a box. Both are moving at an acceleration of 3.5 m/s^2 and I need to find the smallest coefficient of static friction that will prevent slippage.

    2. Will a force applied on top of a box sitting on an inclined ramp make it move? (the force is perpendicular to the ramp)

  2. jcsd
  3. Jun 27, 2008 #2


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    Benjamin, welcome to PF!
    If the book is accelerating, there must be a force acting on it in the direction of the acceleration, per Newton 2.. please show some attempt at a solution for both parts.
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