Firefighter Mechanical Aptitude · Question
A firefighter is using a pry bar to open a car door during an extrication. If the fulcrum is placed close to the door (load) and the firefighter applies force at the end of the handle (effort), what type of lever is being utilized?
With the fulcrum between the effort (firefighter's hand) and the load (car door), a pry bar acts as a first-class lever, providing mechanical advantage.
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Question: A firefighter is using a pry bar to open a car door during an extrication. If the fulcrum is placed close to the door (load) and the firefighter applies force at the end of the handle (effort), what type of lever is being utilized?
Answer options: ✅ First-class lever
- Second-class lever
- Third-class lever
- Compound lever
Correct answer: First-class lever
Explanation: With the fulcrum between the effort (firefighter's hand) and the load (car door), a pry bar acts as a first-class lever, providing mechanical advantage.
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Question explanations
- Scenario 1: Which simple machine uses a fulcrum to multiply force or change the direction of force?
- Scenario 2: If a hydraulic jack has a small piston with an area of 5 cm² and a large piston with an area of 50
- Scenario 3: Which of the following would require the MOST force to move?
- Scenario 4: A rope is tied to a heavy box. Instead of pulling the box directly, a firefighter wraps the rope a
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