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Homework Help: Torque calculation, is this correct?

  1. Sep 12, 2007 #1
    I'm experimenting some ideas and needed a verification of my formula.

    There is a torque arm of 15" with a force of 6000 lbs perpendicular to the axis of rotation. So that calculates to 7500 ft/lbs (6000*15/12). So on the same axis, there is a torque arm of 5" the must oppose this force equally, I need that force required. I calculated 18000 lbs of opposing force with 7500 ft/lbs at the axis (7500/5*12).

    Is this valid?

    No its not a homework question :) I need to know how powerful a single disc brake on a truck is.

    Thanks in advance.
  2. jcsd
  3. Sep 12, 2007 #2


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    Science Advisor
    Homework Helper

    Yes. If you have 1/3 of the moment arm, you need 3 times the force to give the same torque.
  4. Sep 12, 2007 #3
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