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Homework Help: Basic physics problem

  1. Mar 26, 2009 #1
    Hi guys,i'm happy to join you.
    I have the problem shown below for homework and i don't know how to solve it. This is becouse i have missed a lot of lessons during this month becouse of an illness.
    I will apreciate it if anyone can help me with the problem. Thanks.

    Two blocks, one 0.8 kg and the other 2.0 kg are connected by a massless string over a frictionless pulley. The coefficient of kinetic friction is 0.14, and the downward ramp angle is 60 degrees.

    a) Determine the acceleration of the blocks.

    b) Calculate the tension of the string.
  2. jcsd
  3. Mar 26, 2009 #2


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    Welcome to PF!

    Hi kikisf20c! Welcome to PF! :smile:

    (which mass is hanging vertically? and is that 60º from the horizontal?)

    The tension in the string will be the same at both ends (because the pulley is frictionless).

    And the acceleration of both blocks will be the same (beacuse the length of the string is constant).

    And the friction force is µ times the normal force.

    So apply good ol' Newton's second law to each block (separately) …

    what do you get? :smile:
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