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Find the Tension in the rope ( really simple )

  1. Oct 27, 2008 #1
    Find the Tension in the rope ....( really simple :D)

    1. The problem statement, all variables and given/known data
    A block pulled by a string is moving on a horizontal plane with a constant speed, it weighs 25.0 N and its coefficient of kinetic friction is 0.35 . Find the tension in the rope ?


    2. Relevant equations
    Fx = t - Fk
    T = Fk = μk * N = μk *mg


    3. The attempt at a solution
    My answer results 85.84 N ... which is completely off the textbook answer 8.75 which can be yield by μk * m ..... I dont understand why does it eliminate the 'g' out of the equation???
     
  2. jcsd
  3. Oct 27, 2008 #2
    Re: Find the Tension in the rope ....( really simple :D)

    Look at the units mentioned in the question.
     
  4. Oct 27, 2008 #3
    Re: Find the Tension in the rope ....( really simple :D)

    Lol , thanks, i actually came back coz i found the answer and I knew it was something really stupid ......
     
  5. Oct 27, 2008 #4
    Re: Find the Tension in the rope ....( really simple :D)

    No problem! Every year, the AP examiners' report mentions that many many points are lost because of units or calculation errors, so always check the units!
     
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