1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Calculating distance given total work?

  1. Mar 28, 2015 #1
    1. The problem statement, all variables and given/known data
    The total work done is 2.42 * 10^4 J (work is from friction and person pulling a sled). The force of the person pulling is 135 N and the force of friction is 67 N. The angle on the sled is 48.

    2. Relevant equations

    W=f*d*cos0

    3. The attempt at a solution

    I was thinking I would need to do the Wt=f*dcos0 + f*dcos0

    24200=135*d*cos 48 + 67*d*cos 180

    I did this, but the answer was incorrect. the answer is 963 m.
     
  2. jcsd
  3. Mar 29, 2015 #2

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Start by drawing a free body diagram.
     
  4. Mar 29, 2015 #3
    Yes, the question has given that.
     
  5. Mar 29, 2015 #4

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    In what direction is the frictional force, relative to the direction of travel?
     
  6. Mar 29, 2015 #5
    The force of friction is west and the travelling direction is east.
     
  7. Mar 29, 2015 #6

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Then, does friction do positive work, or does it do negative work ?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted