Im finding that some sections of mechanical systems translate better than others onto the flash cards. Im having trouble breaking down Pulley systems and Gears as there is just so much information and feel like i could create a whole set of cards just for each of these subjects. 

Its difficult knowing when I've covered enough of each subjects. What is it I'm making? ... Im making a set of cards which cover some of the main subjects/principles/concepts in mechanical systems. Unless i create a thousand cards I'm never going to cover everything. I think I've covered enough at this point and provided enough information on my cards to give a good overview of the subject. 

 
Ive found that my learning has really taken off since doing the card task and the previous source that weren't really serving a purpose have been a lot more helpful and have used in order to understand how certain parts work in order to translate this knowledge onto the cards. 

The only difficulty I've has is explaining moving parts using just words and diagrams with only a few words. However its made me pick out the most important aspects and present information as clearly as i can.