1. Not finding help here? Sign up for a free 30min 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!

Box on a sphere is nudged- when does it fall off?

  1. Feb 22, 2012 #1
    Box on a sphere is nudged-- when does it fall off?

    1. The problem statement, all variables and given/known data

    A box of mass "m" is placed on a sphere of radius "r". The box is given an extremely small nudge to get it moving.

    (a) What is the maximum speed the ball may have without leaving the sphere?
    (b) At what angle from the vertical does the ball last touch the sphere?

    2. Relevant equations

    I think this is a question requiring energy, so

    Ugpe = mgh
    KE = mv2/2

    But knowing there is a circle involved,

    Fc = mv2/r

    3. The attempt at a solution

    I'm not sure how to attack the problem... I do know that our physics class has not yet gone over anything beyond Newton's three laws and the concepts of gravitational potential and kinetic energy.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 23, 2012 #2
    Re: Box on a sphere is nudged-- when does it fall off?

    ball on sphere?
    you asked box on sphere
    please rephrase question correctly
     
  4. Feb 23, 2012 #3

    Doc Al

    User Avatar

    Staff: Mentor

    Re: Box on a sphere is nudged-- when does it fall off?

    That's all you need. Hint: In addition to energy conservation, make use of Newton's 2nd law. What forces act on the box as it slides down?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Box on a sphere is nudged- when does it fall off?
  1. When will ball fall off? (Replies: 20)

Loading...