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Homework Help: Find Tension

  1. Oct 27, 2014 #1
    1. The problem statement, all variables and given/known data
    A string is attached to a 10 kg block that lies on a horizontal surface. If the string is pulled horizontally with a force of 50 N, friction acting against it is 30 N. What is the tension in the string?

    2. Relevant equations
    F = ma

    3. The attempt at a solution
    Would it be 50 N? Friction wouldn't matter. Or does it matter? The answer is 80 N?
  2. jcsd
  3. Oct 27, 2014 #2


    User Avatar

    Staff: Mentor

    Hi JohnD623! http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif [Broken]
    End of story!

    The tension in the string is the force it carries, 50N.

    To take this question further ...
    30N overcomes friction, so how to account for the other 20N?
    Last edited by a moderator: May 7, 2017
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