Rope on a cylinder

1. Sep 18, 2004

Super_Leunam

WOULD SOME1 HELP ME WITH THIS ANNOYING PROBLEM I CANT SOLVE :
a cat is wrapped around a fixed cylinder .theres friction between the rope and da cylinder with a coefficient of friction (mu) , the angle covered by the rope on the cylinder is (pi)/3 .assume a really thin rope. A cat is pulling on one end of the rope with a force F while 10 mice can just barely prevent from sliding by applying a total force of f . Find (mu) in function of F, f and the angle

i know the answer is has to do with an exponential

thanks

Manuel

2. Sep 18, 2004

Staff: Mentor

belt friction equation

Due to static friction with the cylinder, the tension on the cat end of the rope will be greater than on the mouse end. The relationship between the two tensions, the angle of contact, and mu is given by the so-called "belt friction equation". You can derive it by consider a small element of rope and applying static equilibrium conditions. Then integrate this over the full angle of contact.

Yes, it is an exponential function.

3. Sep 18, 2004

Galileo

:surprised Poor thing!!

I like cats