Firefighter Mechanical Aptitude · Question
Why are gears often used in pairs of different sizes?
Gears of different sizes allow for the modification of rotational speed (speed ratio) and torque (mechanical advantage). A smaller gear driving a larger gear de
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Question: Why are gears often used in pairs of different sizes?
Answer options: ✅ To change rotational speed and/or torque.
- To reduce friction between moving parts.
- To only change the direction of rotation.
- To increase the overall weight of the system for stability.
Correct answer: To change rotational speed and/or torque.
Explanation: Gears of different sizes allow for the modification of rotational speed (speed ratio) and torque (mechanical advantage). A smaller gear driving a larger gear decreases speed and increases torque, and vice-versa.
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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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