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Homework Help: Ball collides inelastically with dangling Rod

  1. Mar 25, 2009 #1
    1. The problem statement, all variables and given/known data
    a 1.0 kg ball is moving horizontally with a velocity, v= 10 m/s, when it makes a glancing collision with the lower end of a bar that was hanging vertically at rest before the collision. For the system consisting of the object and the bar, linear momentum is not conserved but kinetic energy is. the bar, which has length, l= 1.2m, and mass, m=3.0 kg, is pivoted about the upper end. immediately after the collision, the objects moves with new speed, v, at an angle [tex]\theta[/tex] relative to its original direction. the bar swings freely, and after the collision reaches a maximum angle of 90 degrees with respect to the vertical. the moment of inertia of the bar about the pivot is I= (ml2)/3. ignore all friction

    2. Relevant equations
    - determine the angular velocity
    - determine the speed, v, of the 1 kg object immediately after the collision
    - determine the magnitude of the angular momentum of the object about the pivot just before the collision
    - determine angle [tex]\theta[/tex]

    3. The attempt at a solution

    I have no idea where to start
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Mar 26, 2009 #2


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    Welcome to PF!

    Hi Jleath13! Welcome to PF! :smile:
    ah … but angular momentum is. :wink:
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