(Source:http://www.google.co.in/search?hl=en&q=Scissors+Fulcrum+drawing&bav=on.2,or.r_gc
.r_pw.r_qf.&biw=1341&bih=581&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=Q4lJ
UIatJsXWrQeDkoHoCA ; Sept. 7, 2012)

“The position of the fulcrum or the joints in scissors determines the nature of work. The fulcrum position exerts right kind of strength or force for the nature of cutting. Scissors works on the principle of class 1 lever (plate 38A & 39A).  In class 1 Lever, the pivot (fulcrum) is between the effort and the load.  The more the length of the handle or the fulcrum of the scissors, the less force of cutting will be required.  The laparoscopic scissors do not apply the exact law of lever because of the cylinder action of the long shaft, but the design of handle helps in the amplification of force by lever action.”
(Ref. http://en.wiktionary.org/wiki/fulcrum ; Sept. 7, 2012)