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Homework Help: AP Physics B free response practice questions

  1. Nov 25, 2009 #1
    1. The problem statement, all variables and given/known data
    two 10-kilogram boxes are connected by a massless string that passes over a massless frictionless pulley. The boxes remain at rest with the one on the right hanging vertically and the one on the left 2.0 meters from the bottom of an inclined plane that makes an angle of 60° with the horizontal. The coefficents of kinetic friction and static friction between the left-hand bax and the plane are 0.15 and 0.30 respectively.

    2. Relevant equations
    fk = UkN
    N = mg

    3. The attempt at a solution

    c) Determine the magnitude of the frictional force acting on the box on the plane. The string is then cut and the left-hand box slides down the inclined plane.

    D) determine the amount of mechanical energy that is converted into thermal energy during the slide to the bottom.

    E) Determine the kinetice energy of the left hand box when it reaches the bottom of the plane.

    If someone could explain how they got the answers it would help a lot. Thanks.
  2. jcsd
  3. Nov 25, 2009 #2


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    Homework Helper

    Please show us your attempt solution. Nobody here is going to sit around and explain how to do every question step-by-step unless you've made an honest effort to try the questions yourself.
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