Levers/Planes/Axis

• What is a lever?

  A lever us a rigid structure, such as a bar or bone, that rotates around an axis.
• What is a fulcrum?

  A fulcrum is (a pivot) the point around which the lever rotates.

  This is a 1st class lever - Fulcrum is in the middle.

  This is a Triangle acting as a joint e.g: Elbow and Knee.
• What is the Load?

  The Load is the force that is applied by the lever system.

  This is a 2nd class lever - Load is in the middle.

  This is a rectangle showing a body part being lifted e.g: Dumbbell.
• What is the Effort?

  The Effect is the force that is applied by the user of the user of the lever system.

  This is a 3rd class lever - Effort is in the Middle.

  This is an arrow pointing down acting as the bicep.
• Effort Arm?

  Distance between effort and fulcrum.
• Load Arm?

  Distance between load and fulcrum.
• 1st Class Lever?

  Advantage - Stable and strong.

  Disadvantage - Slow, Limited flexibility.
• 2nd Class Lever?

  Advantage - Stable and Strong.

  Disadvantage - Slow, Limited Flexibility.
• 3rd Class Lever?

  Advantage - Fast movement, Large range of motion and Decrease in MA.

  Disadvantage - The force applied must always exceed the load.