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Clock Spring Torque

  1. Nov 27, 2012 #1
    I'm winding up a clock spring from the outside and release from the inside. Is the input torque = to the output torque?

    How would i go about setting up this problem
  2. jcsd
  3. Nov 27, 2012 #2


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    Has to be. Imagine that you are just holding the wound spring from inside and outside. If the two torques don't cancel each other out, there is a net torque on the spring. If there is net torque, it has angular acceleration. But you are holding the spring, so it's not accelerating. Therefore, the two torques are equal.
  4. Nov 27, 2012 #3
    THank you
  5. Nov 27, 2012 #4


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    2017 Award

    I just love those Null Arguments. Bomb proof and take care of all counter intuitive worries.
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