(2)Compare these results with those from the content 2(1)and analyze it. 4.Test the relationship of moment of inertia with the mass distribution. (1)Keep the other conditions(h,r,etc.)constant,change the position of the heavy weight mo,repeat the steps in content 2(1),make a list.Calculate J and Mu (2)Compare these results with those from the content 2(1)and analyze it. Discussion: 1.What will the changing of r indicate?Does it influenceJ? 2.What experimental conditions should be satisfied prior to this experiment? How? 3.Analyze negative factors on this experiment.How to reduce them? 55 （2）Compare these results with those from the content 2(1) and analyze it. 4．Test the relationship of moment of inertia with the mass distribution. （1）Keep the other conditions (h, r, etc.) constant, change the position of the heavy weight m0, repeat the steps in content 2(1), make a list. Calculate J and Mμ. （2）Compare these results with those from the content 2(1) and analyze it. Discussion: 1．What will the changing of r indicate? Does it influence J? 2．What experimental conditions should be satisfied prior to this experiment? How? 3． Analyze negative factors on this experiment. How to reduce them?