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Physics problem: tension.

  1. Oct 12, 2009 #1
    1. The problem statement, all variables and given/known data
    There are two bodies, A and B, body A as 4,0 kg and B as 8,0 kg, the bodies are in a horizontal surface, with no friction. Both bodies are connected by a non-extensible string with unknown mass, which doesn't matter to the case.
    The bodies are moving under de action of a force which has 18,0N of intensity.
    So I have to discover the intensity of the tension, which I happen to know the answer that is 12N, I just can't get there.


    2. Relevant equations
    Resulting force=Weight+wheight+Fn+Fn+t+t+Friction+F
    I think so....

    3. The attempt at a solution
    I really don't know how to solve this, I tried several times and searched for some formulas but i cant get 12N.............
    Sorry about my poor english i'm portuguese.
    Please somebody help me.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 12, 2009 #2

    kuruman

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    The two masses move together with the same acceleration under the influence of a single force of 18 N. Can you find the common acceleration of the masses? That will be a good first step.
     
  4. Oct 12, 2009 #3
    thanks i will try that
     
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