NEWD levers

• 1st class lever

  • extension at the elbow

  
• 2nd class lever

  • plantarflexion of ankle

  
• 3rd class lever

  • hip, knee and elbow flexion

  
• mechanical disadvantage

  • resistance arm is greater than force arm
  • large range of motion
  • cannot move heavy loads but can do it faster
• mechanical advantage

  • force arm is longer than the resistance arm
  • move large load over short distance
  • requires little force
  • small range of motion