1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Work done by Friction

  1. Oct 13, 2004 #1
    Hi everyone. I have another problem that is just stumping me. I posted this earlier and still can't understand it. Here it is...

    A 1-kg ball starting at h = 6.1 meters slides down a smooth surface where it encounters a rough surface and is brought to rest at B, a distance 18.3 meters away. To the nearest joule what is the work done by friction?

    Imagine the ball starting on top of a waterslide, sliding down with no friction, and then coming down onto the straight path that slows you down. I can find the Potential Energy of the ball, but don't know where to go from there! Pls help!
  2. jcsd
  3. Oct 13, 2004 #2
    Law of conservation of energy :
    Total energy in the beginning=Total energy in the end
    [tex]mgh= W_f[/tex]
    The potential energy of the ball has been transformed to heat etc due to the work done by friction.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook