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: Plum bob, Sliding box

  1. Sep 23, 2008 #1
    1. The problem statement, all variables and given/known data
    A plum bob suspended from a frame settles to a steady position as the frame slides down a frictionless inclined plane. What is the angle the plumb bob makes with the vertical during the slide?
    http://img261.imageshack.us/img261/2128/442by1.th.jpg [Broken]http://g.imageshack.us/thpix.php [Broken]


    2. Relevant equations
    The problem is from a section introducing Newton's Laws. I assume this problem is about inertia.


    3. The attempt at a solution
    Utterly no idea how to go about this, although I assume the answer is alpha=theta since that's the clean way the answer could come out.
     
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Sep 24, 2008 #2
    I figured it out. Set T to Fg and the T and m cancel out, leaving tan(theta)=tan(alpha)
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook