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: Torque Question

  1. Jan 20, 2010 #1
    1. The problem statement, all variables and given/known data
    A ladder 12.0m long weighing 125 N rest against a smooth vertical wall. The bottom of the ladder makes an angel of 67 with the deck. A bucket of paint with a mass of 14kg rests o a rung, 7.00m from the bottom end of the ladder. What is the frictional force exerted on the bottom of the ladder?

    2. Relevant equations
    T= F x R x Cos theta

    3. The attempt at a solution

    Sum of forces x: Nw- fs=0
    Sum of forces y= Ng- Fg=0
    Sum of torques: Tnw- Tfg=0

    Do I have these equations correct? I don't know which angles and lengths get plugged into which? Can someone please help me?
  2. jcsd
  3. Jan 20, 2010 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi Power of One! :wink:

    First find the normal force.

    Then take moments to find the friction force. :smile:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook