Firefighter Mechanical Aptitude · Question
Which of the following statements about pulleys is true when lifting a heavy object?
A single fixed pulley acts as a first-class lever, changing the direction of the applied force but offering no mechanical advantage. The force required is equal
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Question: Which of the following statements about pulleys is true when lifting a heavy object?
Answer options: ✅ A single fixed pulley changes the direction of the force but does not reduce the required force.
- A single movable pulley changes the direction of the force and reduces the required force by half.
- A block and tackle system, regardless of the number of pulleys, always requires less distance to pull the rope.
- Pulleys increase the total work needed by reducing the force and increasing the distance.
Correct answer: A single fixed pulley changes the direction of the force but does not reduce the required force.
Explanation: A single fixed pulley acts as a first-class lever, changing the direction of the applied force but offering no mechanical advantage. The force required is equal to the weight of the object.
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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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