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Resolution of forces

  1. Sep 13, 2015 #1
    1. The problem statement, all variables and given/known data
    why cant I resolve the forces in upward direction ? ( as in the sketched diagram)
    the book showed that the (y component ) forces are in downward direction ... why cant be in upward direction ?

    2. Relevant equations


    3. The attempt at a solution
     

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  2. jcsd
  3. Sep 13, 2015 #2
    If you think a situation where the car is not moving. Then all the forces must sum up to zero. If you would take y component forces upward then you would have sum of forces that is not zero. There should be acceleration and after infinity of time cars speed would be infinity?
    Downward force should be same as upward force until the (600N) is bigger than friction.
     
  4. Sep 13, 2015 #3

    SteamKing

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    Why do you want to do this? o_O

    If you draw a free body diagram of the tow ropes, it should become fairly obvious that there are no forces in the upward (sic) direction.

    After all, you can't push on a rope. :wink:
     
  5. Sep 13, 2015 #4
    I drew a free body diagram( pencil -sketched ) , but i gt the forces are in upwards direction . Lol
     
  6. Sep 13, 2015 #5

    SteamKing

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    The you drew the FBD wrong.
     
  7. Sep 14, 2015 #6
    Which part is wrong?i couldn't figure it out
     
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