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ASVAB · General

In a first-class lever (like a seesaw), where is the fulcrum located?

Correct answer

Between the effort (force) and the load

  1. A At one end
  2. B Between the effort (force) and the load
  3. C At the load
  4. D There is no fulcrum

Why this is the answer

In a FIRST-CLASS LEVER, the FULCRUM is located BETWEEN the effort (applied force) and the load — like a seesaw or a pair of scissors. ASVAB Mechanical Comprehension tests the three classes of levers: FIRST-CLASS: fulcrum in the middle (seesaw, crowbar, scissors); SECOND-CLASS: load in the middle (wheelbarrow, nutcracker); THIRD-CLASS: effort in the middle (tweezers, human forearm). Levers provide mechanical advantage. Knowing the arrangement (what's in the middle) for each lever class is commonly tested.
Source: ASVAB Mechanical Comprehension — Levers

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To lift a heavy load with a lever using the least effort, where should you apply the force, and where should the fulcrum be?

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