Frictional Force: Causes & Effect on Rotational Flywheel & Pulley

[DerekWeir29]

Hi guys currently submitting a report for a lab experiment we carried out in college. This was to determine the frictional force of a Rotational Velocity Apparatus.

I have successfully carried out the relevant calculations and in conclusion to my submitted report, I have to explain the differences in theoretical and experimental data.

I am looking for any help or guidance with regards to explaining the causes of frictional force on the rotational fly-wheel and pulley.

 

[Arkavo]

the axle presses on the flywheel (you must have encountered some resistance) so a friction develops