Hello, while my question is not from a textbook, it still has to do with a lab I'm creating. My lab was to view the efficiency of rotational KE of a bike's pedals to the KE of the bike itself. Using 1/2*I*ω^2 and 1/2*m*v^2 to find KE, I seemed to have run into a problem. The KE of the bike was around 30 J, but the rotation KE of my pedals was around .4 J. I'm not the best at physics, but how could the bike "create" energy? I would assume I'm wrong in some form. I'm sparing you the details, for I simply just need to know what about the value I'm getting is wrong. Thanks for your help!