This is for a lab report that I have to do for physics class. In the lab, we have to tie one end of the string with some mass in one end, add a glass rod through the string, and then tie some more mass to the other end of the string. We have to hold the glass rod and start whirling one end of the mass around in a cir cle. Now my question is, other than adding oil around the rim of the glass rod, what another way to reduce friction? Thanks.