levers

• levers use mechanical advantages to make lifting to applying pressure easier
• levers consist of a pivot (fulcrum) the input force (effort) and output force (load)
• first class is when the fulcrum is in between the effort and load

  if the load is closer to the fulcrum it becomes easier if it in the middle it will balance out

  A) falcrum

  B) effort

  C) load

  
• second class is when the load is between the effort and fulcrum the closer the fulcrum and load the easier it becomes

  A) effort

  B) load

  C) fulcrum

  
• third order is when the effort is in between the fulcrum and load

  if the fulcrum is further apart it becomes easier to lift

  they dont have mechanical advantages

  A) fulcrum

  B) effort

  C) load

  
• to work out mechanical advantage

  MA= load/effort
• work = effort x distance moved
• reverse motion linkage:

  A) effort direction

  B) load direction

  C) fulcrum

  
• this a bell crank

  
• types of first class levers

  • crowbar
  • seesaw
  • scissors
• types of second class levers

  • wheelbarrow
  • bottle opener
  • stapler
• types of third class levers

  • tweezers
  • fishing rod
  • bow and arrow
• FLE can be used to remember the order of levers

  1st=Fulcrum

  2nd=load

  3rd=effort