levers

• levers


  a lever is a rigid bar that allows the application of increased “FORCE” and/or “SPEED”.​

  all levers have common parts :​

  • an axis (point of rotation)​
  • a resistance (load to be overcome)​
  • a force (effort)
• 1st class levers 


  force-axis-resistance

  eg. scissors, rowing, extending the head
• 2nd class levers 


  axis-resistance-force

  -used when a heavier load is to be moved

  eg. toe raise, wheel barrow
• 3rd class levers

  axis-force-resistance

  -most common in the human body

  -used to increase speed

  eg. bicep curl, kicking a ball
• mechanical advantage


  .