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!

Qn. on general rotational mechanics

  1. Nov 14, 2012 #1
    1. The problem statement, all variables and given/known data

    a uniform rod of mass m nd length 2l lies on smooth horizontal surface. a particle of mass m is connected to a string of length l whose other end is connected to one of the ends of the rod. initially string is taut and both string and rod lie in same plane with 90 angle b/w them. if particle is given velocity v perpendicular to string, then jus after givin velocity find tension in string and angular acceleration of rod.

    2. Relevant equations

    3. The attempt at a solution
    i tried using ζ = Iα about centre of mass but could not succeed..plzz help.....
  2. jcsd
  3. Nov 14, 2012 #2


    User Avatar
    Gold Member

    I would think that when the velocity was imparted to the particle, since is it attached to the rod via a string (assumed inextensible, otherwise it's a spring) then the same velocity would be imparted to the end of the rod.
  4. Nov 14, 2012 #3


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    No, the particle is driven perpendicularly to the string.
    Always start by creating some names for unknowns that might be relevant:
    T = tension
    α = angular acceleration of rod
    a = linear acceleration of rod.
    Then draw the free body diagram and try to write down some equations using the conservation laws. Post whatever you come up with.
  5. Nov 14, 2012 #4


    User Avatar
    Gold Member

    That makes for a more interesting problem. Reading is fundamental :redface:.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Qn. on general rotational mechanics
  1. General Rotation (Replies: 2)

  2. Rotational mechanics (Replies: 2)