2.1.1 First-class levers

• Levers are classified into three main types based on the relative positions of the load, effort, and fulcrum.


  True
• In a first-class lever, the fulcrum is located between the load and the effort.
• In a first-class lever, the fulcrum is located between the load and the effort.
• An example of a first-class lever in the human body is the neck extension.
• The effort in a lever system is the force applied to move the load.
• The fulcrum is the pivot point around which the lever rotates
• Match the lever class with its fulcrum position:

  First-class ↔️ Between load and effort

  Second-class ↔️ Between fulcrum and load

  Third-class ↔️ Between fulcrum and effort
• What is the definition of the load in a lever system?

  Weight or resistance being moved
• What is the mechanical advantage of a first-class lever?

  Power or speed
• What acts as the fulcrum in the neck extension example of a first-class lever?

  Atlanto-occipital joint
• What are levers used for?

  Amplify force or speed
• What determines the mechanical advantage of a lever?

  Relationships between components
• The load in a lever is the weight or resistance being moved
• A first-class lever can provide either power or speed
• The mechanical advantage of a first-class lever depends on the fulcrum's position
• What is the main advantage of a third-class lever?

  Greater speed
• A lever is a rigid bar that rotates around a fixed point called the fulcrum
• What is the position of the fulcrum in a first-class lever?

  Between load and effort
• The lever rotates around the fulcrum, with the load on one end and the effort applied on the other end.

  True
• Match the example with the lever class:

  Scissors ↔️ First-class

  Wheelbarrow ↔️ Second-class

  Fishing rod ↔️ Third-class
• A lever is a simple machine that rotates around a fixed point called the fulcrum.


  True
• A lever is a simple machine consisting of a rigid bar that rotates around a fixed point called the fulcrum.


  True
• What is an example of a first-class lever in the human body?

  Neck extension
• When the fulcrum is closer to the load in a first-class lever, what is increased?

  Force
• What are the three main parts of a lever?

  Load, effort, fulcrum
• What characterizes a first-class lever?

  Fulcrum between load and effort
• In a first-class lever in the human body, the fulcrum lies between the load and the effort.


  True
• In a second-class lever, the fulcrum is closer to the load