Firefighter Mechanical Aptitude · Question
The efficiency of a machine is always less than 100% due to:
No real-world machine can be 100% efficient due to energy losses, primarily from friction between moving parts and resistance from the surrounding medium (like
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Question: The efficiency of a machine is always less than 100% due to:
Answer options: ✅ Friction and air resistance.
- The Law of Conservation of Energy.
- The principle of mechanical advantage.
- Overtightening of components.
Correct answer: Friction and air resistance.
Explanation: No real-world machine can be 100% efficient due to energy losses, primarily from friction between moving parts and resistance from the surrounding medium (like air). These losses convert some input energy into unusable heat.
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- 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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