levers

• a lever is any device that can turn about a pivot
• load: the force acting on a body
• effort: the force exerted by the body to overcome the load
• types of levers

  • first class lever
  • second class lever
  • third class lever
• a first class lever is one where the fulcrum is in between the effort and the load
• a second class lever is one where the load is between the effort and the fulcrum
• a third class lever is one where the effort is between the fulcrum and the load