2.1.1 First-class levers

• A see-saw is an example of a lever where the fulcrum is in the middle.


  True
• What is the effort in a lever system?

  The force applied to the lever
• In a first-class lever, the effort is applied on one side of the fulcrum.


  True
• The force applied to move the load in a lever is called the effort
• The three classes of levers are distinguished by the relative positions of the fulcrum, effort, and load
• What is an example of a second-class lever?

  Wheelbarrow
• Where is the fulcrum located in a first-class lever?

  Between effort and load
• What is a real-life example of a first-class lever?

  See-saw
• The closer the fulcrum is to the load in a first-class lever, the greater the mechanical advantage
• What are the three main components of a lever?

  Fulcrum, effort, load
• In a first-class lever, where is the fulcrum located?

  Between effort and load
• In a first-class lever, the fulcrum is located between the effort and the load.
• In a first-class lever, the fulcrum is always between the effort and the load.
• In a see-saw, what role does the fulcrum play in mechanical advantage?

  Provides leverage
• The fulcrum is the fixed point around which the lever pivots
• A wheelbarrow is an example of a second-class lever
• What is the position of the fulcrum in a first-class lever?

  Between effort and load
• The fixed point around which the lever pivots is called the fulcrum
• In a see-saw, what serves as the fulcrum?

  The middle point
• What is an example of a first-class lever?

  See-saw
• In a first-class lever, the fulcrum is always located at one end of the lever.

  False
• In a first-class lever, the fulcrum is positioned between the effort and the load
• What is the fulcrum in a pair of scissors?

  The screw connecting blades
• In first-class levers, a smaller effort can lift a heavier load if the fulcrum is closer to the load.


  True
• The fixed point around which a lever pivots is called the fulcrum
• Arrange the components of a first-class lever in their correct order from left to right:

  1️⃣ Effort

  2️⃣ Fulcrum

  3️⃣ Load
• What is an example of a first-class lever that uses a central pivot as the fulcrum?

  See-saw
• The closer the fulcrum is to the load in a first-class lever, the greater the mechanical advantage.


  True
• Why are first-class levers not ideal for tasks requiring quick movements?

  Inefficient for speed
• What is a lever defined as?

  A rigid bar that pivots
• What is an example of a first-class lever?

  See-saw
• Match the lever class with its effort position:

  First-class ↔️ On one end

  Second-class ↔️ On the other end

  Third-class ↔️ Between fulcrum and load
• The effort in a lever system is the force applied to move the load
• The object being moved by a lever is called the load
• Match the lever class with the correct arrangement of fulcrum, effort, and load:

  First-class ↔️ Fulcrum between effort and load

  Second-class ↔️ Load between fulcrum and effort

  Third-class ↔️ Effort between fulcrum and load
• What is an example of a third-class lever?

  Tweezers
• In a see-saw, the fulcrum is the central pivot
• In a crowbar, what serves as the fulcrum?

  The edge it rests on
• What is the mechanical advantage in levers?

  Ratio of forces
• What is a lever defined as?

  A rigid bar with a fulcrum