Measured values:

   radius of pulley          R  =  _________  +/-  ___________     cm

   mass of falling weight    m  =  _________  +/-  ___________     grams

   mass of brass weight 1   M1  =  _________  +/-  ___________     grams

   mass of brass weight 2   M2  =  _________  +/-  ___________     grams
   
   dist weight-to-axis 1    L1  =  _________  +/-  ___________     cm

   dist weight-to-axis 2    L2  =  _________  +/-  ___________     cm



----------------------------------------------------------------------------

Computed values 

                     rod alone                                                     rod-plus-weight


 Use a graph to determine linear acceleration of the falling weight


   acceleration of weight    a  =  _________  +/-  ___________     cm/s^2          a  =  _________  +/-  ___________   cm/s^2


 Write an equation to compute the tension in the string


                _________________________

   now calculate it

   tension of string         T  =  _________  +/-  ___________   g*cm/s^2        T  =   _________  +/-  ___________  g*cm/s^2
    


 Write an equation to compute the torque on the pulley 


                _________________________

   now calculate it

   torque on pulley        tau  =  _________  +/-  ___________   g*cm^2/s^2         =   _________  +/-  ___________ g*cm^2/s^2
    


 Write an equation to compute the angular acceleration of the pulley


                _________________________

   now calculate it

   ang accel of pulley   alpha  =  _________  +/-  ___________     rad/s^2          =   _________  +/-  ___________  rad/s^2
    


 Write an equation to compute the moment of inertia of bare rod


                _________________________

   now calculate it

     mom of rod only    I(rod)  =  _________  +/-  ___________     g*cm^2           
    



 Write an equation to compute the moment of inertia of rod-plus-weights


                _________________________

   now calculate it

                                                                mom of rod-plus   I  =  _________  +/-  ___________   g*cm^2  
    


 Write an equation to compute the moment of inertia of weights only


                _________________________

   now calculate it

     mom of weights    I(weights)  =  _________  +/-  ___________   g*cm^2          
    



  Okay, good.  All the values above are based on measurements of the
falling weight causing the rod and brass cylinders to spin.   
  
  Now, let's use theory.  You can compute the moment of inertia of the
two brass cylinders easily if you approximate them to be point masses
spinning around the central axis.

 Write an equation to compute the THEORETICAL moment of inertia of weights only


                _________________________

   now calculate it

     THEORY mom        I(theory)  =  _________  +/-  ___________   gram*cm^2
    


   Do the theoretical and measured values agree?