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Tension in string when force is applied to both ends

  1. Dec 4, 2008 #1
    Hi,

    I've got a quick question about tension. If there is a force applied to both ends, the total tension is the sum of those forces, right (i.e., they don't cancel each other out)?

    TIA!
     
  2. jcsd
  3. Dec 4, 2008 #2

    Doc Al

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    Staff: Mentor

    Wrong. Take a massless string for example. To create a tension of 100 N within the string, you must apply a force of 100 N to both ends. (Those forces don't add up.)
     
  4. Dec 4, 2008 #3
    So when the string is vertical and in equilibrium with a mass hanging from it, there is a certain force exerted downwards by the mass and that same force exerted upwards by whatever the top end of the string is attached to?
     
  5. Dec 4, 2008 #4

    Doc Al

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    Staff: Mentor

    That's right.
     
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