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: Explantion please

  1. Oct 1, 2005 #1
    Hi,
    I need some explanation about a problem:

    A heavy man stands on a ladder that is leaning against a rough-surfaced wall and rests on the ground. Dranw the free-body diagram for the system of the man and the ladder. If the ground is very smooth, the ladder may stast to slip. Why.

    I need some explantions for the WHY question .

    Thanks
     
  2. jcsd
  3. Oct 1, 2005 #2

    HallsofIvy

    User Avatar
    Science Advisor

    Explanation of WHAT? Do you know what a "free-body" diagram is? Can you determine the various forces acting here? What are the forces on the man? What are the forces on the ladder?
     
  4. Oct 1, 2005 #3
    Yes, I found the forces on the man and on the ladder.
    On the man there is only the gravity.

    On the ladder, on the botton I have the reaction with the ground and a friction force directed toward the wall. On the top of the ladder, there are a reaction force coming out the wall and a vertical friction force.

    I need explantion why the ladder starts to slip if the ground is very smooth.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook