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: 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