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Pulleys, Gears, and Levers 1 Flashcards

6 cards from real FCTC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A movable pulley is used to lift a 240-lb load. Ignoring friction, how much force must be applied to the rope?

    Answer: 120 lb

    A movable pulley provides a mechanical advantage of 2 because two rope segments support the load. The required effort is 240 ÷ 2 = 120 lb.

  2. Gear X has 20 teeth and Gear Y has 80 teeth. If Gear X rotates at 160 RPM, how fast does Gear Y rotate?

    Answer: 40 RPM

    The speed ratio is inversely proportional to the number of teeth: (20 ÷ 80) × 160 = 40 RPM. The larger gear always turns more slowly than the smaller driver gear.

  3. A lever has an effort arm of 6 feet and a resistance arm of 2 feet. What is the mechanical advantage?

    Answer: 3

    Mechanical advantage of a lever = effort arm ÷ resistance arm = 6 ÷ 2 = 3. This means a 3:1 force multiplication is achieved.

  4. A block-and-tackle system applies 50 lbs of effort through 6 rope segments supporting the load. What is the maximum load that can be lifted, ignoring friction?

    Answer: 300 lb

    The mechanical advantage equals the number of supporting rope segments (6), so the maximum load = 6 × 50 = 300 lb.

  5. Which of the following is an example of a third-class lever?

    Answer: Fishing rod

    A fishing rod is a third-class lever: the effort (hand gripping the rod) is applied between the fulcrum (the butt end) and the load (the fish). Third-class levers trade force for speed and range of motion.

  6. Two meshed gears have a gear ratio of 4:1 (driver to driven). If the driver gear produces 10 lb-ft of torque, what torque does the driven gear produce, ignoring friction?

    Answer: 40 lb-ft

    When speed is reduced by a gear ratio of 4:1, torque is multiplied by the same ratio: 10 × 4 = 40 lb-ft. Speed and torque trade off proportionally in a gear pair.