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Recently, I have done an experiment of frictional on rolling object.

In the experiment, I have done 7 trials with different axle radii, similar to that of a yoyo on a horizontal table.

the experimental was set as this

As derived by the lab manual i received, frictional force can be plotted as a function of axle radius.

f=2mgMR(R-2r)/(3MR^2+4m(R+r)^2)

The graph plotted using my experimental data is very strange.......

Both graphs are plotted by f as a function of r. The one on the right is plotted according to my experimental data. The one on the left is a plot of the equation above. Why the graphs are so different? Is there anything wrong?

In the experiment, I have done 7 trials with different axle radii, similar to that of a yoyo on a horizontal table.

the experimental was set as this

As derived by the lab manual i received, frictional force can be plotted as a function of axle radius.

f=2mgMR(R-2r)/(3MR^2+4m(R+r)^2)

The graph plotted using my experimental data is very strange.......

Both graphs are plotted by f as a function of r. The one on the right is plotted according to my experimental data. The one on the left is a plot of the equation above. Why the graphs are so different? Is there anything wrong?

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