1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Rolling Motion Up an Incline

  1. Mar 26, 2015 #1
    1. The problem statement, all variables and given/known data
    A hollow sphere of mass M and radius R (I = 2MR2 /3) is released from rest at height h and rolls down a curved surface without slipping until it reaches the lowest point, O..

    The curve to the right of O is frictionless. If the sphere continues past point O, what vertical height will it reach?
    (In the diagram, the curve looks like a semi circle)
    2. Relevant equations
    KEr = 1/2 M W2
    KEl = 1/2MV2

    3. The attempt at a solution
    According to my knowledge, if its frictionless and energy is conserved it should reach the same high.

    mgh = 1/2 M W2 + 1/2MV2

    **If I did something wrong I apologize, first time on this forum
  2. jcsd
  3. Mar 26, 2015 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Hello John Kolby. Welcome to PF !

    Does the rotation of the sphere change once it gets to the frictionless part of the curve?

    Does its rotation correspond to some amount of kinetic energy?
  4. Mar 26, 2015 #3
    I don't think the rotation changes. The rotation accounts to Kr which I account for with 1/2MW2
  5. Mar 26, 2015 #4
    Solved it thank you!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted