Homework Help: % Energy lost due to friction

1. Oct 2, 2011

lab-rat

Can the % of Energy lost due to friction be negative? Or is it always positive?

2. Oct 2, 2011

nkk2008

It is always positive. A negative loss is an addition and if that were the case, we would all have infinite motion machines that produce energy via friction. A nice idea, but impossible.

Nkk