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Difficulty: EasyLevers and Fulcrums

Match each common tool or device to its correct lever classification based on the relative positions of the fulcrum, effort, and load.

  • SeesawFirst-class lever
  • Handheld bottle openerSecond-class lever
  • TweezersThird-class lever

Answer

Seesaw matches with First-class lever. Handheld bottle opener matches with Second-class lever. Tweezers match with Third-class lever.
The classification of a lever depends entirely on which component is located in the middle. By breaking down the physical action of each tool, we determine that a seesaw has its pivot in the center (first-class), a bottle opener lifts a load situated between the pivot and the handle (second-class), and tweezers are squeezed in the middle to grasp a load at the ends (third-class).

Step-by-Step Solution

1
Analyze the mechanics of a seesaw.
The fulcrum is in the center.
When the fulcrum is located between the effort and the load, it is a first-class lever.
2
Analyze the mechanics of a handheld bottle opener.
The load (bottle cap) is in the middle.
When the load is located between the fulcrum and the effort, it is a second-class lever.
3
Analyze the mechanics of tweezers.
The effort (fingers squeezing) is in the middle.
When the effort is applied between the fulcrum and the load, it is a third-class lever.

Key Concept

Lever Classifications (First, Second, and Third Class)
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Topics

Levers and Fulcrums

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