Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Why does a glass topple when the cloth is pulled from under it

  1. Oct 26, 2011 #1
    When the cloth is pulled slowly, the glass moves with the cloth, when pulled faster, it topples. When jerked from underneath the glass, the glass stays put. Explain in terms of inertia and torque.

    I think I have the first and last part, I'm confused about why it topples, however. Any help at all is appreciated
  2. jcsd
  3. Oct 26, 2011 #2


    User Avatar
    Gold Member

    Explain your ideas so far.
  4. Oct 26, 2011 #3
    my ideas are:

    when it's pulled faster, it has to overcome the force of the static friction, as the cloth does move underneath the glass. I believe the kinetic friction is what is affecting it, but I'm not sure where torque is involved
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook