5.4.2 Levers and Gears

• A lever rotates around a fixed point called the fulcrum
• The fulcrum's position affects the type of lever.

  True
• The moment is measured in Newton-metres
• Order the types of levers based on the fulcrum's position relative to input and output forces:

  1️⃣ First-class

  2️⃣ Second-class

  3️⃣ Third-class
• The moment of a force depends on the size of the force and its distance from the pivot.


  True
• Increasing the distance from the pivot decreases the moment.

  False
• Third-class levers sacrifice force for increased speed and range of motion
• A force of 50 N is applied 0.5 m away from the pivot. What is the moment?

  25 Nm
• The moment of a force depends on both its magnitude and direction.


  True
• There are three main types of levers.

  True
• Order the types of levers based on the fulcrum's position relative to input and output forces:

  1️⃣ First-class

  2️⃣ Second-class

  3️⃣ Third-class
• What determines the mechanical advantage of a lever?

  Fulcrum position
• The moment of a force depends on the size of the force and its distance from the pivot
• What is the formula for calculating the moment of a force?

  Force x Distance
• Arrange the three classes of levers based on the fulcrum position.

  1️⃣ First-class: Fulcrum between input and output

  2️⃣ Second-class: Fulcrum between input and output

  3️⃣ Third-class: Fulcrum between input and output
• A lever rotates around a fixed point called the fulcrum.


  True
• A force of 50 N is applied 0.5 m away from the pivot. What is the moment?

  25 Nm
• What is a lever?

  A rigid bar
• The fixed point around which a lever rotates is called the fulcrum
• The moment is calculated by multiplying force and distance.


  True
• The moment of a force is its turning effect around a pivot
• The moment of a force increases proportionally with the force applied.

  True
• What determines the mechanical advantage of a first-class lever?

  Fulcrum-input and output distances
• Increasing the force applied to a lever decreases its moment.

  False
• Arrange the three components of a lever based on their role.

  1️⃣ Fulcrum: Fixed point of rotation

  2️⃣ Input Force: Force applied to the lever

  3️⃣ Output Force: Force exerted by the lever
• The mechanical advantage of a first-class lever can be less than one.


  True
• Match the lever type with its mechanical advantage:

  First-class ↔️ Can be >1, <1, or =1

  Second-class ↔️ Always >1

  Third-class ↔️ Always <1
• Increasing the distance from the pivot point increases the moment proportionally.


  True
• Spur gears are known for their straight teeth.
• A lever is a rigid bar that rotates around a fixed point called the fulcrum
• The fulcrum position in a lever determines its type and mechanical advantage.

  True
• Understanding moments is crucial for analyzing stability and rotational effects of forces.


  True
• Match the lever type with its mechanical advantage:

  First-class Lever ↔️ Can be >1, <1, or =1

  Second-class Lever ↔️ Always >1

  Third-class Lever ↔️ Always <1
• What effect does increasing the force have on the moment?

  Increases proportionally
• What is one main function of gears in mechanical systems?

  Changing the speed
• Which type of lever always has a mechanical advantage greater than one?

  Second-class
• First-class levers can have a mechanical advantage greater than, less than, or equal to one
• Spur gears are simple cylindrical gears with straight teeth.
• What are spur gears and helical gears commonly used for?

  Changing speed of rotation
• The choice of gear type depends on the specific requirements of the application.

  True