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Homework Help: Net Torque

  1. Oct 28, 2008 #1
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Oct 28, 2008 #2

    Hootenanny

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    You're on the right lines, but you need to be careful here.

    What is the definition of F and r?
     
  4. Oct 28, 2008 #3
    F is the force and r is the radius
     
  5. Oct 28, 2008 #4

    Hootenanny

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    Good
    Not quite.
     
  6. Oct 28, 2008 #5
    then?
     
  7. Oct 29, 2008 #6

    Hootenanny

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    It is the position vector directed from the centre of rotation to the line of action of the force. Another important point to realise is that you need to take the cross product of F and r, not simply multiply them.
     
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