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Homework Help: Answer Problem

  1. Mar 8, 2004 #1
    Answer Problem!!

    A BOX WEIGHIN 200N IS 2 B SLID SLOWLTHROUGH 20 M ON A ROUGH STRAIGHT TRACKFRICTION COEFF=O.2I HAV 2 FIND THE WORK DONE BY THE FORCE ACTIN ON THE BOX!IF THE FORCE ACTS AT AN ANGLE 'A'WITH THE HORIZONTAL!!
    I CANT GET THE ANSWER!
     
  2. jcsd
  3. Mar 8, 2004 #2

    chroot

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    Please tell us your thoughts on the problem, and what you have come up with so far.

    - Warren
     
  4. Mar 8, 2004 #3

    ShawnD

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    W = Fd

    The force must be parallel with the displacement! F is not the total force applied to the box. F is actually the force applied * cos([tex]\theta[/tex]).
     
    Last edited: Mar 8, 2004
  5. Mar 11, 2004 #4
    ok... unless u know the angle A i doubt this problem can be solved.... most prolly the coef. of friction is coef. of kinetic friction.... so then the force of friction is (coef.)*mass*g and so the work done by it is distance*force of friction (jsut as shawn said). But if the coef. of friction is static friction, then this problem can't be solved. coz the work done by friction cud be 0 if the applied force is insufficient to move the block
     
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