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: Collision of boulder and ice-fishing shack

  1. Nov 6, 2006 #1
    A 55.6 kg boulder sat on the side of mountain beside a lake. The boulder was 14.6m above the surface of lake. One winter night, the boulder rolled down the mountain, directly into a 204 kg ice-fishing shack that was on a frozen lake. What was the velovity of the boulder and the shack at the instant that they began to slide across the ice? If the coefficient of friction between shack and rough ice is 0.392, how far did the shack and boulder slide?

    Ok I figured that
    m1v1 + m2v2= v' (m1 + m2)

    then mgh = 0.5mv^2
    (55.6*9.8*14.6) = 0.5*(204+55.6)v^2

    I don't know why they are giving us friction for.

    Someone please help soon. I have test tommorow!
  2. jcsd
  3. Nov 6, 2006 #2
    You need the friction to calc out the distance traveled.
  4. Nov 7, 2006 #3
    I don't know how? Do we use d=E/f
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook