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Question

Difficulty: EasyLevers and Fulcrums

Pair the following everyday tools with their correct mechanical lever classification.

  • A pair of scissors cutting through cardboardFirst-Class Lever
  • A guillotine-style paper cutter slicing a sheetSecond-Class Lever
  • A broom being used to sweep the floorThird-Class Lever

Answer

Scissors match to a First-Class Lever, the paper cutter matches to a Second-Class Lever, and the broom matches to a Third-Class Lever.
Lever classes are defined by which component is located in the middle: the Fulcrum (Class 1), the Load (Class 2), or the Effort (Class 3). The mnemonic 'FLE 123' is commonly used to remember this rule.

Step-by-Step Solution

1
Analyze the mechanical arrangement of the scissors.
The fulcrum is between the effort and the load, making it a Class 1 lever.
To classify the lever based on its central component.
2
Analyze the mechanical arrangement of the paper cutter.
The load is positioned between the fulcrum and the effort, making it a Class 2 lever.
To classify the lever based on its central component.
3
Analyze the mechanical arrangement of the broom.
The effort is applied between the fulcrum and the load, making it a Class 3 lever.
To classify the lever based on its central component.

Key Concept

Lever Classification by Central Component
Estimated Time:45s
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Topics

Levers and Fulcrums

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