Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Finding Work done by friction

  1. May 7, 2012 #1
    a 500 kg crate is on a rough surface inclined at 30°. A constant external force
    P = 4000 N is applied horizontally to the crate. The force pushes the crate a distance of 3.0 m up the
    incline, in a time interval of 9.2 s, and the velocity changes from ν1 = 1.0 m/s to ν2 = 2.8 m/s. The
    work done by the friction force is closest to:

    I have no idea how to start this. I tried just using the regular work equation or conservation of energy and did not find the answer.
  2. jcsd
  3. May 7, 2012 #2
    You are posting this in the wrong forum.

    Anyway, find the work done by the force, then find the work done to bring it from a lower to a higher region, to increase the velocity, etc. , and just minus off all of them to find the work done to overcome friction.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook