Mechanical advantages

• • Resistance arm - distance between effort and fulcrum
  • Effort arm - distance of resistance from fulcrum

  Mechanical advantage = effort arm/resistance arm
• • 2nd class levers are used to move heavy loads - strength
  • 1st and 3rd class levers are used to move loads further and faster - greater distance and speed
• BENEFITS

  • 1st and 3rd - short effort arm - rapid movement
  • 2nd - short resistance arm - ability to move heavy weight - high value of mechanical advantage
• • 3rd class lever is at a disadvantage at the hip - needs to apply greater force to lift body weight - effort and resistance arm are same distance