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Question on working out forces acting on a brick.

  1. Apr 24, 2012 #1
    http://imgur.com/MyxXW

    Attempt at solution for the last question:
    ƩF=f1-f2
    Ʃf=25-2.81=22.19N
    The force is acting downwards, towards the center of the earth.

    Could you lovely people check this over and check if I have it right? Because I have a bad feeling about it.
     
    Last edited: Apr 24, 2012
  2. jcsd
  3. Apr 24, 2012 #2
    As far as I can see, it looks right to me.
     
  4. Apr 25, 2012 #3
    Woohoo! I'm not going to fail A-level physics! Thanks man.
     
  5. Apr 25, 2012 #4
    What about the friction? Imagine they put the brick on your arm. You would feel a downward force as you have calculated, yes. But if they started pulling the brick, would you feel your arm being pulled too, assuming that there was significant friction?
     
  6. Apr 25, 2012 #5
    Friction has nothing to do with what the last question is asking.
     
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