Ah, right, thanks. So it is indeed valid to say that it does both positive and negative work, as long as it does no net work, even if it acts over zero distance?
There is just one thing still bothering me. If we do the analysis from the contact point/a point on the incline, friction cannot...
Huh, alright. So not only is static friction doing work, but it is doing positive work... I have to admit I didn't really realize that could happen (I tend to think of friction being a source of energy loss only, in the cases where it does work at all.)
The energy is clearly coming from the...
Homework Statement
This is not a homework problem. Okay, it is -- but I have solved it correctly already, so the question is not there. I'm just not sure about a detail in one of many solutions.
We have a hollow cylinder with a uniform mass distribution rolling down an incline with some...