Auto Parts: Systems, ancient greeks, archimedes

Question
Hi
Thank you vey much for reading my question. I don't know if you are able to help me, but if you could, please tell me what gears, pulleys, levers and hydraulics are and what their importance is.
Also is it necessary to use hydraulics, and who started the concept.
Thank you very much
Sean

Answer
    I'll be honest with you.  This is not an automotive question, although all of these things are present in automobiles.  That's because automobiles are machines, and these things are present in almost all machines.  In fact, several of these items are among the basic machines identified by the ancient Greeks, Archimedes in particular.  Physics 101 is the best source for learning about them.